ML20203H728
| ML20203H728 | |
| Person / Time | |
|---|---|
| Issue date: | 01/06/1999 |
| From: | Marshall M NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Butler J NUCLEAR ENERGY INSTITUTE (FORMERLY NUCLEAR MGMT & |
| References | |
| REF-GTECI-MI, REF-GTECI-SC, TASK-***, TASK-OR NUDOCS 9902230085 | |
| Download: ML20203H728 (11) | |
Text
{{#Wiki_filter:.. w' PD E r. FACSIMILE COVER SHEET U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Regulatory Applications i Generic Safety issues Branch f DATE: January 6,1999 l TO: John Butler, Senior Project Manager Nuclear Energy Institute i i Fax #: 202-785-1898 Phone #: 202-739-8108 FROM: Michael L. Marshall, Jr., Task Manager i EC Fax #: 301-415 5151 Phone #: 01-41g5895 8 m c Number of Pages Exchding gver Sheet: 9 A OF MST SET OF MSThS A@ - 191: A
- SUBJECT, EXPLANATORY NOTES (4
g Hello John: Attached is the restructured questionnaire that we discussed before the holidays. After you have had an opportunity to review the list of questions and their explanatory notes, please, call me at 301-415-5895 so we can discuss the questions and NEl's timetable for collecting responses from licensees. j The responses to the attached questions will be used to conduct analyses, design and conduct experiments, and conduct risk assessments to assess the impact of debris J accumulation on PWR ECCS (i.e., sump) performance. The responses would allow the NRC staff and LANL staff to use realistic plant data during the GSI-191 study instead of arbitrarily selecting values and conditions that may not be representative of plant design or operation. The responses will be used to set the ranges for parametric studies. Cordially, &cbtAh &b Michael Marshall i Task Manager 230 c;(>i j cc: R. Elliott R. Lobel D. Skay b Public Document Room - +++ 9502230085 990106 PDR REVQP ER C X3
_ _... _ _ _ _, ~ = P t S%s FACSIMILE COVER SHEET U.S. Nuclear Regulatory Commission Office of Nuclear Regulatory Research Division of Regulatory Applications Generic Safety lasues Branch t DATE: January 6,1999 TO: John Butler, Senior Project Manager t Nuclear Energy Institute Phone #: 202-739-8108 Fax #: 202-785-1898 FROM: Michael L Marshall, Jr., Task Manager i l Phone #: 301-415-5895 Fax #: 301-415-5151 Number of Pages Excluding Cover Sheet: 9 9 6'GSt 191: TRANSMITTALOF FIRST SET OF QUESTIONS AND SUBJEC' : EXPLANATORY NOTES T Hello John: 1 Attachep is the festructured questionnaire that we discussed before the holidays. A s,. have had an opportunity to review the list of questions and their explanatory notes, please, call me at 301-415-5895 so we can discuss the questions and NEI's timetable for colle responses from licensees. The responses to the attached questions will be used to conduct analyses. design an conduct experiments, and conduct risk assessrnents to ass staff and LANL staff to use realistic plant data during the GSt-191 study instead of arbi selecting values and conditions that may not be representative of plant design or opera The responses will be used to set the ranges for parametric studies. l Cordially, %JArAf ( Michael Marshall Task Manager cc-R. Elliott R.Lobel D.Skay Public Document Room +++
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.s I i GSI-191 Study Questionnaire (1/99) ! Page 1 of Ef 1 r i, i Questions ! Unit 1 Explanatory Notes 'I - 1. Briefly describe the LBLOCA that is the basis n/a Use: This information will be used to establish the conditions in containment - for responding to the following questions. that may effect debris generation, transport, accumulation, and head loss. Content of Response: Include system, location, diameter of break, and type of break (e.g., DEGB). If a description of the LBLOCA is contained in the FSAR,. ! please, identify which postulated accident is the basis for responding to the following questions (e.g., LOCA-6). i i-l Sample Response: Double-ended main steam line break at containment wall. i t l a. Following a LBLOCA, what is the ft Use: This information will be used to estimate debris transport (e.g., amount of l containment flood level (i.e., depth of debris settling, transport rate of debris to sump). water on floor) at time switch over i from refueling water storage tank (or j borated water storage tank) to sump? b. Following a LBLOCA, when does the sec Use: This information will be used to estimate debris transport (i.e., amount of j low pressure safety injection (LPSI), debris settiing). residual heat removal (RHR), and/or i recirculating pumps start to draw suction from the sump? i c. Following a LBLOCA, what is the ft Use: This information will be used to estimate debris transport. I maximum containment flood level? d. Fo!!owing a LBLOCA, when is the sec Use: This information will be used to estimate debris transport. maximum containment flood level reached? e, Which water sources are used to n/a Some plant FSARs do not inver.torv water from the molten ice or one of four i determine flood level (e.g., RCS accumulator tanks. This is treated as ar. additional margin-of-safety in FSAR. spillage, RWST inventory, in risk assessment and debris transportation estimates such knowledge may containment spray, ice me!t, etc.)? vary some of the results. l j i l l Use: This information will be used to estimate debris transport. i =
i GSI-191 Study Questionnaire (1/99) j Page 2 of 6 . Questions Unit Explanatory Notes i. Briefly describe the Medium Break LOCA n/a See Question 1 and its explanatory notes. l 2 (MBLOCA) or intermediate break LOCA the I i is the basis for responding to the following . questions, a. ~ Following a MBLOCA, what is the ft See Question 1 and its explanatory noic containment flood level (depth of I water on floor) at time switch over l from refueling water storage tank (borated water storage tank)? i
- See Question 1 and its explanatory notes.
l b. Following a MBLOCA, when does the ; sec i low pressure safety injection (LPSI), residual heat removal (RHR), and/or i j j .j recirculating pumps start to draw l suction from the sump? c. Following a MBLOCA, what is the ft See Question 1 and its explanatory notes. maximum containment flood level? I d. Following a MBLOCA, when is the ! sec See Question 1 and its explanatory notes. l l maximum containment flood level reached? it l e. Which water sources are used to n/a See Question 1 and its explanatory notes. determine ficod level (e.g., RCS spillage, RWST inventory, containment spray, ice melt, etc.)? 3. Provide a sketch of the containment sump (s). n/a Detailed response to this set of questions is very important. Small features, such as curbs, may significantly influence debris transport. j Use: This information (and the following sump information) will be used to estimate debris transport, accumulation, and head loss. This information will also be used to design any experimental facility that may be need. Sarnple Response: See Figures 1 thru 3 (!! j _ e 4 ..- m m m . m t --,er-- s c
t GSI-191 Study Questionnaire (1/99) Page 3 ofgl i l Unit l <1 . Questions i Explanatory Notes l How many containment (recirculating) t n/a Use: This information will be used in estimating debris transport, debris i t l a. sumps? i accumulation, and head loss associated with the accumulation of debris. The i i I information will also be factored into risk assessment. b. What is the depth below containment ft Example: see Figures 4 thru 6. ~ floor of containment (recirculating) 1 sump (s)? l c. What is the height above the ft Example: see Figures 4 thru 6. f l j containment floor of the containment (recirculating) sump screen (s)? d. Does the sump have a screen? j n/a Use: Responses to this question will be used to calculate debris transport, accumulation and head loss. I Example: see Figures 4 thru 6. I 2 e. How much screen area is available? It Use: Estimation of head loss across debris bed and design of experiments i f. What is the hole size in the sump l inch Use: Estimation of head loss across debris bed and design of experiments. screen? I l Sample Responses: 1/4" diameter perforations at 5/16" center to center, #4 mesh with 3/16" openings, mesh with 0.187" openings, etc. g. Does the sump have a trash rack? n/a See Question 3d and its explanatory notes. ) _ Example: see Figures 4 thru 6. h. What is the distance between the inch sump screen and the trash rack? I 2 i. How much trash rack is available? i ft See Question 39 and its explanatory notes. [ j. What is the hole size in the trash inch See Question 3i and its explanatory notes. rack? Sample Responses: stainless steel grating with 4" by 1/3" spacing, mesh with 4" by 4" openings,1" by 1/4"_ grating, etc. k. Does the sump have a solid or screen n/a Example: see Figures 4 thru 6. i cover plate? ? i
i GSI-191 Study Questionnaire (1/99) Page 4 of 6 j i Questions ! Unit Explanatory Notes l l 1. Inside the sump does the ECCS n/a See Question 3d and its explanatory note. I pumps draw suction through a vortex l suppressor or strainer, if so provide a l l sketch? j m. Does the sump have a debris curb? n/a Use: The responses to this question will be used to estimate debris transport and accumulation. i i i r i Example: see Figures 4 thru 6. n. What is the height of the debris curb? ft Example: see Figures 4 thru 6. o. What is the distance between the ft , Example: see Figures 4 thru 6. debris curb and sump screen? l 1 l ' 4. Provide a plan view sketch of the j Containment features, such as compartmentalization, can significantly influence l n/a containment elevation that the sumps are debris transport. located. i j Use: Responses to this question will be used to estimate debris transport and i j accumulation. also, responses will be used to design experiments. j i l Sample Response: see Figures 7 and 8. l 4 a. Containment type? n/a This information is needed if plant names are not included with the collected data. l l l Examples of Responses: large dry, sub-atmospheric, or ice condenser 2 b. What is the containment floor area ft Use: Responses to this question will be used to estimate the volume of water t (open area only)? on the containment floor, to calculate bulk flow rates and to design experiments. l I c. Where are the sumps located? n/a Content of Response: It is preferable if sump locations were shown on the plan view sketch of the containment. i d. How many compartments and n/a Content of Response: It is preferable if sump locations were shown on the plan" subcompartments in containment? view sketch of the containment. Provide a list of the compartments. i 5 I - ~. -
m-I GSI-191 Study Questionnaire (1/99) l Page 5 of S ; t i I Questions ! Unit i Explanatory Notes e. What are the size of openings f ft f Content of Response: Response should not include opening the are not between compartments? expected to be open during a postulated accident. Indicate on list of l compartments. l l Sample Response: 4' x 8' to 6" diameter openings i i l f. How many openings between Content of Response: It is preferable if sump locations were shown on the plan j n/a compartment? view sketch of the containment. Indicate on list of compartments or sketch. i I l i g. What are the locations of openings i n/a Content of Response: It is preferable if sump locations were shown on the plan ; i between compartments? view sketch of the containment. !5. Idenify potential debris sources.
- Use: Different debris types (e.g., insulation) behave differently following a l LOCA. Therefore, the staff needs to understand what types of debris sources i
l are in PWRs. This information will also be used to design experiments and in ! all analyses. a. List the types of service level 1 n/a j Sample Responses: epoxy phenolic on steel surfaces, epoxy mastic on steel coatings in containment. l and concrete surfaces (e.g., carbomastic 15, Amerlock 400NT), inorganic zinc , on steel surfaces (e.g., Dimetcote6 (D6), Carboline CZ-11), epoxy polyamide i on steel or concrete surfaces (e.g., Val-Chem 89 series, Carboline 2191, e l Starglaze 2011S), phenotines on steel or concrete surfaces (e.g., Phenoline { 368 WG, Carboline 890), vinyl on steel surfaces, etc. b. Provide a rough estimate of the Sample Response: epoxy phenolic on steel surface (35%), vinyl on steel amount (square footage) of each type j surface (5%), phenolines on concrete surfaces (60%) i of service level 1 coating in that is in ; containment. List the types of thermalinsulations in, n/a I Sample Responses: aluminum reflective metallic insulation, stainless steel c. containment. l reflective metallic insulation (e.g., MIRROR), fiberglass blanket, encapsulated fiberglass, jacketed fiberglass (e.g., NUKON@, Thermal-Wrap @), mineral wool i blankets, calcium silicate, jacketed calcium silicate, min-k blanket, k-wool j blanket, etc. d. Provide a rough estimate of the Sample Response: reflective metallic insutstion (80%), calcium silicate (10%), amount of thermalinsulation (by encapsulated fiberglass (10%) i volume or square feet) that is in l l containment. j
l GSI-191 Study Questionnaire (1/99) l Page 6 of 6 Questions . Unit Explanatory Notes j i
- Some fire barrier are made with fibrous material.
i i e. List the types of fire barrier materials n/a l in containment. f. Provide a rough estimate of the See Question 5d and its explanatory note. i amount of fire barrier material (by volume or square feet) that is in containment. [ l g. List the types of filter materials in n/a It has been postulated that filter materials dicintegrate following a LOCA and containment. would generate fine fibrous debris. Use: This information will be used to assess the potential for debris to be l generated from filter materials. I h. Provide a rough estimate of the j See Question 5d and its explanatory note. 4 amount of filter material (by volume j i or square feet) that is in containment. ; i I t i. Following a LBLOCA, what is the ppm ' It has been postulated that boron in sump water reacts with Zn from the paint boron concentration in water on the chips and precipitates small Zn-hydroxide particles, which is an additional I containment floor? source of debris. However, this reaction is very slow at low boron I concentration that are typical of many US PWRs. Staff wants to get a good understanding of this potential. Use: This information will be used to make a determination whether ti e formation boron precipitates is a credible particulate debris source. l j. Following a MBLOCA, what is the ' ppm See Question Si and its explanatory note. i l boron concentration in water on the containment floor? j [ 6. Are there procedures available providing l n/a Assumptions regarding recovery actions would substantially alter risk f instruction on switching to an attemate water j estimates, and thus the overall outcome of this issue. i source if the sump is unavailable? What is the water source? Use: Responses to this question will be used in the risk assessment.
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