AMS Configuration Control Board

AMS Configuration Control Board CR AMS-02/D-014 Multi-Layer Insulation for the Alpha Magnetic Spectrometer – Requirements Document (JSC 65095) CR AMS-02 D-014

Comments for AMS-02/D-014 CCB Member Responses Steve Porter, Chair No Comment/Recommendation Trent Martin (EA) Approved – as Written Paul Nemeth (ESCG) Approved – as Written Mark Schmalz (EA2) No Comment/Recommendation Ann Vaughan (DA) No Comment/Recommendation J. J. Conwell (MA) Approved – as Written John Stanford (NT) Approved with Comments Win Reid (OZ) Approved with Comments Jack Keifenheim (KSC) No Comment/Recommendation Bill Hungerford (AMS) Approved with Comments CR AMS-02 D-014

Comments for AMS-02/D-014 Mandatory Evaluator Responses Craig Clark Approved with Comments Christian Vettore Approved with Comments Marco Molina Approved with Comments CR AMS-02 D-014

Comments from John Stanford Para: 1.0 Introduction Since this is a requirements document, Add subparagraphs: 1.3 Applicability [who does it apply to; how is it binding on them] 1.4 Waivers and Deviations [ If compliance to requirements is not possible, what is the waiver or deviation process?] 1.5 Revisions and Changes Evaluation of Non-incorporation: No clear established applicability, waiver or deviation process, change or revision process. Comments for AMS-02/D-014 CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 2.0 Reference Documents Since this is a requirements document, then there must be traceability to parent requirements. Therefore, there parent requirements are contained in "applicable" documents. Further, documents that are used in a "requirements statement" are applicable documents. For example, SP-R-0022, SSP 30233F, JSC 29789, JSC 63134, JSC 27301, JPR 5322F and others are part of requirements statements in this document. Change To: 2.0 Documents; 2.1 Applicable Documents; 2.2 Reference Documents; 2.3 Order of Precedence Evaluation of Non-incorporation: Requirements traceability is not clearly established. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 2.0 Reference Documents When updating this document, add JSC 63164, Quality Management Plan for the AMS-02 Experiment to the "applicable document" list. Evaluation of Non-incorporation: Requirements traceability is not clearly established. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.0 Requirements Problem: "However, for some of these elements, there may be no requirement. For example, impact protection is addressed but is not a requirements for MLI blanket fabrications. These are very confusing statements. Why isn't impact protection a requirement? Recommendation 1: Re-write this area to CLEARLY summarize the development of requirements for MLI blanket fabrication and handling Evaluation of Non-incorporation: Requirements traceability is not clearly established. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Figures 1 and 2 Problem: Where do these fit into the text? CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Figures 1 and 2 Problem: Where do these fit into the text? Para. 3.1.3 Impact Protection From: The MLI blankets are intentionally not designed to provide micrometeoroid and orbital debris shielding? To: Deleted. Rationale: This is a requirements document for fabrication and handling and has no bearing on MMOD. Evaluation of Non-incorporation: Confusing and misplaced requirement. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.1.1 AMS Thermal Environment From: Verification shall be by review of design and materials. To: Verification shall be by Test or Analysis. Rationale 1: Test with unproven materials. The material composition of the blanket must be shown to meet the -150 degree C to +120 degree C requirement. Rationale 2: For proven materials, analysis should be sufficient to establish that the requirement is met. Evaluation of Non-incorporation: Inappropriate verification of a requirement. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.1.2 Depressurization and repress From: Verification shall be by analysis and review of design. To: Verification shall be by Test or Analysis. Rationale 1: Test with unproven materials. The material composition of the blanket must be shown to meet this requirement. Rationale 2: For proven materials, analysis should be sufficient to establish that the requirement is met Evaluation of Non-incorporation: Inappropriate verification of a requirement. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.1.4 Radiation From: The MLI blankets shall not be damaged by UV radiation or atomic oxygen, therefore MLI blankets that are directly exposed to the environment shall have a UV and atomic oxygen resistant outer cover. To: MLI blankets that will be directly exposed to UV radiation and atomic oxygen shall have a UV radiation and atomic oxygen resistant outer covering. Rationale: The first statement has two "shall" statements. The way the first requirement is written, you must verify the (1) ALL blankets are not damaged by UV radiation or atomic oxygen and (2) that those "directly exposed the environment" are equipped with the resistant covering. Evaluation of Non-incorporation: Unnecessary verifications. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.1.5 Solar Electromagnetic Radiation From: MLI exposed to the entire solar electromagnetic spectrum shall not embrittle or show significant changes in physical properties during its useful life. To: MLI exposed to the entire solar electromagnetic spectrum shall not embrittle or show significant changes in physical properties during its use life as defined in paragraph 3.5.1. Rationale: The first statement as written is NOT verifiable. Evaluation of Non-incorporation: Cannot be verified. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.1.6 Solar Ionizing Radiation From: Solar ionizing radiation issues are not within the scope of this document. To: Deleted. Rationale: This is not a requirement. If it is important, then it should be addressed elsewhere Evaluation of Non-incorporation: Useless chatter. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 3.2 Contamination From: Contamination including subparagraphs 3.2.1 and 3.2.2. To: Deleted. Rationale: This is not a requirement. If it is important during FABRICATION and HANDLING, then write as real requirements Evaluation of Non-incorporation: Useless clutter in document. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Para. 1.1 Purpose From: This document provides the requirements for the fabrication and handling of multi-layer insulation (MLI) for the Alpha Magnetic Spectrometer project. To: This document provides the requirements for fabrication, handling, storage, and repair of MLI…. Rationale: This document mixes apples and oranges when it comes to requirements. For instance, paragraph 3.1 Operational Requirements and subparagraphs are important to know, but they should be in a specification document. The purpose only addresses "fabrication and handling", yet there paragraphs on storage and repair. Evaluation of Non-incorporation: Confusing document. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraphs 3.1 Operational Requirements, 3.5 Maintainability and Reliability, and 3.6 Materials Specifications From: Inclusion in the documents. To: Deleted. Rationale: These "requirements" are related to "MLI specifications", therefore should not be in this document. Evaluation of Non-incorporation: Requirements that are not related to the purpose of the document. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraphs 3.3 Quality Assurance Provisions From: The MLI shall be designed and fabricated in accordance with the Quality Management Plan for the Alpha Magnetic Spectrometer (AMS-02) experiment. To: 3.3.1 MLI fabricated at JSC shall follow the provisions of JPR 5335.3, JSC Quality Manual. 3.3.2 MLI fabricated at Collaboration shall follow the provisions of JSC 63164, Quality Management Plan for the AMS-02 Experiment. Rationale: Evaluation of Non-incorporation: Inappropriate quality processes. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Title: From: Multi-Layer Insulation for the Alpha Magnetic Spectrometer Requirements Document To: Requirements Document for MLI Fabrication, Handling, Storage and Repair Evaluation of Non-incorporation: Inappropriate title. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.1 In Fabrication Handling From: It is recommended that an ISO Class 8 (Class 100,000) or better clean room be used for the initial manufacture of all Thermal Blankets. In the event that a blanket is manufactured in a facility that does not meet these requirements, this information must be brought to the attention of the Thermal Working Group. Buy-off by the Thermal Working Group will be required prior to flight certification. To: 3.4.1.1 Fabrication Facility Fabrication shall be in a a facility that meets the requirements of paragraph 3.8. Rationale: Redundant to paragraph 3.8. Evaluation of Non-incorporation: Inefficiency. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.1 In Fabrication Handling From: All tools, work tables, equipment, templates, holding fixtures, sewing machines or other structures that may contact the MLI shall be cleansed before use with a solvent having a nonvolatile residue not exceeding 0.02 g/L. Compatibility of solvents with MLI materials and surfaces that are in contact with MLI materials must be assessed before use. To: 3.4.1.3 Cleanliness of Equipment, Tools and Other structures. All tools, work tables, equipment, templates, holding fixtures, sewing machines or other structures that may contact the MLI shall be cleansed before use with a solvent having a nonvolatile residue not exceeding 0.02 g/L. Compatibility of solvents with MLI materials and surfaces that are in contact with MLI materials must be assessed before use. Rationale: Too many shalls in a paragraph, violates good requirements writing. Evaluation of Non-incorporation: Inefficiency. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.1 In Fabrication Handling From: Work tables and sewing machines shall have clean protective covers when not in use. To: 3.4.1.4 Protective Covers. Work tables and sewing machines shall have clean protective covers when not in use. Rationale: Too many shalls in a paragraph, violates good requirements writing. Evaluation of Non-incorporation: Inefficiency. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.1 In Fabrication Handling From: Workers shall wear clean laboratory smocks, powder-free latex gloves or clean white gloves, and footwear that is kept in the laboratory change/locker area when not used or use disposable footwear covers. To: 3.4.1.5. Laboratory Clothing Workers shall wear clean laboratory smocks, powder-free latex gloves or clean white gloves, and footwear when handling or working with MLI. Clothing WILL be kept in the laboratory change/locker area when not used or use disposable footwear covers. . Rationale: Too many shalls in a paragraph, violates good requirements writing. Evaluation of Non-incorporation: Inefficiency. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.1 In Fabriaction Handling From: Large items of equipment being moved into a clean room must be thoroughly vacuumed prior to entry.. To: 3.4.1.6. Large items of equipment being moved into a clean room SHALL be thoroughly vacuumed prior to entry.. Rationale: Too many shall in a paragraph, violates good requirements writing. Evaluation of Non-incorporation: Inefficiency. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.3 Installation Handling From: The clean blankets shall be removed from their packages in a clean area. Personnel should wear powder free gloves to handle the unpacked blankets. To: Delete " Personnel should wear powder free glove to handle the unpacked blankets". Powder free gloves are not defined.. Rationale: A person could wear leather gloves (inappropriate), yet comply with the "powder free' statement. Evaluation of Non-incorporation: Confusion. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from John Stanford Paragraph 3.4.4 Repair From: Repairs shall be done either in place or in controlled clean area depending on the extent of damage. To: Define "in place." Rationale: . Evaluation of Non-incorporation: Confusion. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from Bob Miley/Win Reid Electrical: Paragraph 3.6.2 of MLI document states that the Electrical Bonding & Grounding requirements are per NASA/TP-1999-209263. My understanding is that the correct compatible requirements for ISS Electrical Bonding and Grounding of AMS MLI requirements needs to be compatible with the SSP 30240 and SSP 30245. Electrical General: The Electrical Bonding and Grounding for Space Shuttle is not addressed in the AMS MLI requirements document. CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from Bob Miley/Win Reid Thermal and Contamination - Editorial: The MLI Requirements specify that an MLI blanket with an aluminized reinforced polyimide inner layer. These blankets are delicate and damage to the inner layer provides a path for atomic oxygen to reach the inside. Damage to the inner layer frequently happens during assembly. Atomic oxygen will cause the blanket to delaminate and spread debris, sometime after approximately 5 years. Therefore, the proposed AMS MLI design must meet the following ISS SSP 30426 requirements, which are applicable to the MLI blankets for station. (Continued on next slide) CR AMS-02 D-014

Comments for AMS-02/D-014 Comments from Bob Miley/Win Reid SSP 30426 - 3.4.2 PARTICULATE BACKGROUND - The release of particulates from the ISS shall be limited to one particle 100 microns or larger per orbit per 1x10-5 steradian field of view as seen by a 1 meter diameter aperture. SSP 30426 - 3.5.2 SOLIDS, PARTICULATES, AND LIQUID RELEASES - Solids, particulates and liquid releases shall not result in residual deposits as indicated in paragraph 3.5.1 or damage to the ISS surfaces from either direct or subsequent orbital impingement. CR AMS-02 D-014

AMS Configuration Control Board