ML20011E369
| ML20011E369 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 02/06/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20011E360 | List: |
| References | |
| NUDOCS 9002130298 | |
| Download: ML20011E369 (6) | |
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6 UNITO STATES 3
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION j
I RELATEDTOREQUESTFOR,CODERELlEFFORCO,NTAINMENTISOLATIONVALVES O
O DETROIT EDISON COMPANY WOLVERINE POWER SUPPLY COOPERATIVE. INCORPORATED r
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DOCgT,NO.50-341 C T 1.0 INTROD_UCTION Fy letter dated December 6, 1986, Detroit Edison Company (Deco) requested relieffromtheASPEPoilerandPressureVesselCode,SectionXI,1980 Edition, Winter Addendum 1981. The December 6, 1988, request superseded Deco relief requests dated September 20, 1985, and July 31,1987. The request specificelly requests relief for 34 valve groups involving 84 containnient isolation valves frnm the requiren.ents to perfm Category A-Containment Isolation Air Leakage Tests on each valve individually as required by Subsection IKV, Article IKV-3000 Paragraphs 3426 ard 3427 of the ASME Section XI, Poiler and Pressure Vessel Code.
By' letter dated November 15, 1989 Deco providtd clarifications concerning the specific testing of valve E11-F408 and assignment of leakagt limits for penetrations.
The relief request was evaluated utilizirs the criteria and guidance contained in the Code of Federal Regulations 10 CFR 50.55a and Generic Letter 89-04,
- Guidarce on Developing Acceptable Inservice Testing Prograns." Relief was recorrended where it was determined that the request adequately meets one nr i
riore of the following criteria:
The proposed alternative provides a level of quality and safety essentially equivalent to that afforded by the Code required testing.
Testing the affected components in accordance with the Code requirements is impractical and the proposed testing provides adequate assurance to operational readiness.
Testing the affected components in acccrdance with the Code requirements would place an unreasonable burden on the licensee without a compensating increase in safety and the propcsed alternative testing provides adequate assurance of operational readiness, t
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.t 2.0 RELIEF REQUEST The licensee has requested relief from the requirements of Section XI, Paragraphs IW-3426 and 3427, to individually leak rate test the containment isolation valves listed in the attached table and proposed to collectively leak rate test these valves in the groupings identified in the table.
Acceptance criteria will be established for each valve grouping and corrective action will be taken as required by IW-3427 on a valve-by-valve basis if the measure group leakage rate exceeds this criteria.
2.1 Licensee's Basis For Requestina Relief Due to system configuration, the valves listed in the attached table cannot be individually leak tested.
The attached identifies the containment isolation valves (CIVs) which must be collectively leak tested in valve groups.
The table also prmeides the corresponding paimary containment penetration number and valve sizes.
The containment isolation valves listed in the table will be collectively leak tested according to the valve groups given in the table.
The test leakage will be compared to the maximum leakage assigned to each group.
The test leakage will also be trended according to the requirements of IW-3427.
If the test leakage exceeds the criteria required by IW-3426, valves in the af fected group will be subject to the corrective actions of IW-3427.
The valve most likely to be the leaker will be repaired first and the group retested.
If the test leakage is within the criteria, no further testing will be performed.
2.2 Evaluation The leak test procedures and reqri ements for containment isolation valves identified by 10 CFR Part 50, Appendix J are considered equivalent to the Section XI leak rate testing requirements since they incorporate all of the major elements of Paragraphs IW-3421 through 3425 (refer to Generic Letter 89-04, Attachment 1. Item 10).
It is not practicable to individually leak rate test these valves, because of the system design and lack of appropriate test taps.
Compliance with the code would require redesign or replacement of system components.
The only practical method of verifying the leak-tight integrity of these valves is to leak rate test the identified valve groups at the specified penetrations.
Appendix J, Type C, leak rate testing should adequately determine the leak-tight integrity of these valves.
The 10 CFR Part 50, Appendix J leak rate testing does not evaluate er establish corrective actions based on individual valve leakage rates, therefore, the
" Analysis of Leakage Rates" and " Corrective Action" requirements of Section XI, Paragraphs IW-3426 and 3427(a) must be followed as closely as practicable.
The licensee stated that maximum leakage rates will be assigned to each valve group and if the measured leakage exceeds the assigned limit, corrective actions will be taken until a retest yields results below the assigned group limit.
This test method should provide a reasonable assurance of leak-tight integrity of
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these valves as long as the assigned limiting leakage rate for each valve grouping is conservative considering the number and sizes of valves in the group, During meetings with Deco, the staff expressed concerns over the method used by DECO in establishing and assigning group leakage limits.
By letter dated November 15, 1989, DECO committed to re-evaluate the administrative leakage limits assigned to each valve group.
New administrative limits will be establithed that will consider all valves in the penetration group, rather than the simple sum of individual limits assigned to each of the valves in a group based on size.
The new criteria will be established in February 1990, i
and procedure changes to incorporate the new administrative limits by June 1990.
The staff has reviewed DECO's commitment and schedule and finds both acceptable.
3.0 CONCLUSION
Based on the evaluation summarized herein, the staff concludes that relief be granted from the requirements to perform Category A Containment Isolation Air Leakage Test on each valve individually as required by Subsection ]WV, Article IWV-3000, Paragraphs 3426 and 3427 of ASME Section XI, Boiler and Pressure Vessel Code for the 84 containment isolation valves listed in the December 6,1988, relief l
request.
The staff has determined that pursuant to 10 CFR 50.55a(g)(6)(1) granting relief where testing requirements are impractical is authorized by law, will not endanger life or property or the common defense and security, and is otherwise in the public interest considering the burden that could result if the requirements were imposed on the facility.
Principal Contributors:
R. Li and John Stang Date:
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TABLE VR-46-R2 Penetration ID Numbers of Valves Valve Size Number in Groupino (Inches)
X-7A B21-F022A (V17-2003) 26 B21-F028A (V17-2007) 26 X-78 B21-F0228 (V17-2001) 26."
B21-F028B (V17-2005) 26 '
X-7C B21-F022C (V17-2002) 26 B21-F028C(V17-2006) 26 X-70 821-F022D (V17-2004) 26 B21-F028D (V17-2008) 26 X-9A B21-F076A(V12-2002) 20 E41-F006 (V8-2194) 14 X-9B B21-F076B(V12-2001) 20 E51-F013 (V8-2228) 6 G33 F120 (V8-4615) 4 1
X-11 E41-F003 (V17-2021) 10 E41-F006 (V17-2088) 1 X-12 E11-F009 (V8 2091) 20 E11-F608 (V8-3407) 20 E11-F408 (V8-3874) 0.75 X-13A E11-F050B (VB 2164) 24 E11-F610B (V13-7688) 1 X-13B E11-F050A (V8 2163) 24 E11-F610A (V13-7687) 1 X-15 T4804-F603A (V4 2144) 4 T4804-F605A (V4 2154) 4 X-22 T49-F601 (V4 2080) 1.5 T49-F465 (V4 2079) 1.5 j
T49-F465 (V4 2079) 1.5 X-25 T4803-F602 (VR3 3024) 24 T46-F402 (VR3 3023) 24 T46-F411 (VR3 3026) 6 X-26 T4803-F601 (VR3 3011) 24 T48-F407 (VR3 3012) 24 T48-F408 (V4 2060) 10 3
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TABt.E VR-46-R2 (Cont.)
Penetration ID Nurecers of Valves Valve Size Number in Grouping (Inches)
K-27a T50-F401B (V5-2159) 1 X-27c T50-F403B (VS-2161) 1 X-27d T50-F404B (V5-2162) 1,'
X-27e T50-F405B (V5-2163) 1' X-27b T50-F402B (VS-2160) 1 P34-F404A (V13-7374) 0.75 X-27b T50-F402B (V5-2160) 1 P34-F403A (V13-7364) 0.75 X-31B T48-F453 (VR3 2823) 1 T48-F454 (VR3 2824) 1 T48-F455 (VR3 2825) 1 F
X-36 T49-F602 (V4 2188) 1.5 T49-F468 (V4 2187) 1.5 T49-F016 (V8 4140) 1.5 X-37 c11-F010 (V8-2073) 1 X-38 c11-r011 (V8-20ss) 2 X-37 C11-F180 (V8-3876) 1 X-38 c11-F181 (V8-3877) 2 X-44 T4804-F603B (V4 2143) 4 T4804-F605B (V4 2153) 4 X-48a T50-F401A (V5-2151) 1 X-48b T50-F402A (V5-2152) 1 X-48c T50-F403A (V5-2153) 1 X-48d T50-F404A (V5-2154) 1 X-48e T50-F405A (V5-2155) 1 X-205A T23-F450B (V21 2014) 20 T23-F410 (V21 2016) 20 X-205B T23-F450A (V21 2013) 20 T23-F409 (V21 2015) 20 X-205C T48-F404 (VR3 3013) 20 T49-F405 (VR3 3014) 20 T48-F409 (V4 2061) 6 X-205D T46-F400 (VR3 3015) 20 T46-F401 (VR3 3016) 20 T46-F412 (VR3 3019) 6 T48-F410 (V4 2063) 6 4
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i TABLE VR-46-R2 (Cont.)
l Penetration ID Numbers of Valves Valve Size Number in Grouping (Inches)
X-2050 T48-F456 (VR3-2826) 1 T48-F457 (VR3-2827) 1 T48-F458 (VR3-2828) 1 i
X-211A E11-F024B (V8 2136) 18 i
E11-F027B (Y8-2158) 6 E11-F028B (V8 2156) 18 X-211B E11-F024A (V8 2135) 18
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E11-F027A (V8-2157) 6 E11-F028A (V8 2155) 18 i
X-215 T4804-F602A (V4 2142) 4 i
T4804-F606A (V4 2156) 4 X-218 T4804-F601A (V4 214'0) 8 T4804-F604A (V4 2148) 8 X-218 T4804-F601B (V4 2139) 8 T4804-F604B (V4 2149) 8 X-219 T4804-F602B (V4 2141) 4 i
T4804-F606B (V4 2155) 4 h
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