ML20236G928
| ML20236G928 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/31/1987 |
| From: | Agosti F DETROIT EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| TAC-63529, NUDOCS 8708050002 | |
| Download: ML20236G928 (8) | |
Text
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Deron r.,mi2 Edison EIEN Wm.
1 July 31, 1987 NRC-87-0133:
U. S. Nuclear Regulatory Commission Attn Document Control Desk 1
Washington, D. C. 20555
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References:
- 1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43 i
- 2) Detroit Fdison' Letter to NBC, " Relief Request to Inservice Testing Program for Puups and Valves," dated Septenber 20, 1985. (BC-LG-85-0004)
- 3) Relief Request VR-46 (Submitted with Reference 2)
Subject:
Relief Request to Inservice Testing Program for Pumns and valves Relief Request VR-46-R1, which supersedes Relief Request VR-46 to the l
Fermi 2 Inservice Testing (IST) Program for Pumps and Valves, is being transmitted herewith in accordance with 10CFR50.55a(g) (5) (iii).. The attached Relief Request addresses _ leakage limits of Containment Isolation valves (CIV) which cannot be individually leak -tested i
pursuant to 10CFR50, Appendix J.
The following summarizes the changes made in Relief Request VR-46-Rl.
j These changes were made to correct _ typographical errors and to reflect the latest philosophy regarding leakage limits..
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- 1) The maximum leakage for penetration X-9A lFeedwater) and X-ll' (HPCI Steam Supply) is being decreased from q
I 5.88 SCFH to 5.00 SCFH and from-1.90 SCFH.to 1.50 SCFH respectively.
Fermi 2 UFSAR Section 6.2.1.2.2.3 impoces a maximum
-1 total leakage of 4 percent of La for all Bypass.
Leakage Valves - (BLV). These 'new leakage ~1imits for penetrations X-9A and.X-11 conform to both 10CFR50 Appendix J and to plant safety analysis for Bypass.
Leakage valves.
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USNBC July 31, 1987 NBC-87-0133 Page 2
- 2) The maximum leakage for penetrations X-27 A, C, D, E &
F (H,3 0,3 Monitoring Sample Lines) is being decrGased from 0.86 SCFH to 0.85 SCFH to correct a l
typographical error.
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- 3) The maximum leakage for penetration X-205 D (Suppression Pool Purge and Vent) is being increased from 0.51 SCFH to 0.52 SCFH to correct a typographical l
error.
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- 4) The maxinum leakage for penetrations X-37 and X-38 (CRD lines) is being increased from 0.52 SCFH to 5.00 SCFH. This increase is based on the Control Rod Drive seals as being the containment boundary rather than j
the test valves themselves being the containment boundary. Because these valves will always have a water seal during a design basis accident, leak j
testing the valves with air in lieu of water will i
provide a more conservative test method.
- 5) Valve B21-F434 is being removed from valve group leak I
testing of main steam line penetrations X-7A, X-7B, X-7C and X-7D.
Due to newly established test nethods
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and test boundaries, valve B21-F434 can now be
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individually leak tested pursuant to 10CFR50, 1
Appendix J.
If you have any questions concerning this relief request, please j
contact Mr. G. D. Ohlemacher at (313) 586-4275.
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Sincerely, l
~ 4SE l
l Frank E. Agosti, Vice President l
Nuclear Operations Attachnent cc:
A. B. Davis E. G. Greenman W. G. Rogers J. J. Stefano USNBC Region III
l A'ITACINENT l
Detroit Fdison Fermi 2 l
J Relief Request to Inservice Testing Program for Pumps and Valves No. VR-46-R1 1
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RELTEF ' RmUEST NO. VR-46-R1
'SYSTm:
Systems Penetrating Primary Containment CatPOTE: Valves subject to AS'iD Section XI, Category A Containment Icolation
- Air Leakage Testa (AT-1 and AT-9). See Table VR-46-R1 for list of. valves.
- CATm0RY r A and A/C FmT' TION: The subject valves perform a containment isolation function as
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defined in 10CFR50, Appendix A, Criteria 55 and 56.
TRST RmUTRU U RS: Measure valve seat leakage and compare the measurcd leakage to a specific maximum leakage for each valve (IWV-3426).
BASTS FOR RELTEF: Due to Gystem configuration the valves listed in Table VR-46-R1 cannot be individually leak tested. Table VR-46-R1 identifies the Containment Icolation Valves (CIV) which must be collectively leak tested in valve groups. Thic Table also provides the corresponding primary containment penetration number, valve sizes and. maximum leakage limit for each of thenc valve groups.
The maximum leakage limit for most of thene CIV groups was derived by multiplying the num of the valve diameters in each group by 0.173 SCFH/ diameter inch.
Maxiraum Leakage = (sua of valve diameter inches) x (0.173 SCPH/ diameter inch) l The value of 0.173 SCFH/ diameter inch was derived by dividing 0.6 La (178' TFH) by the cum of all air tested Containment Isolation valve diameters (1025.5 inches). La io defined by Technical Specification 3.6.1.2.'a.
The maximum leakagen for penetration X-9A and X-11 were not derived from the I
above methcxiology. Becauce penetrations X-9A and X-ll involve Bypann Leakage Valves (BLV) E41-F006, E41-F003 'and E41-F600, the leakage limito for these penetrations were derived to satisfy a total Dypasa Leakage limit of 4 percent of La, as defined in plant cafety analysis (UFSAR Section 6. 2.1.2.2.3). : The leakage limits for these penetrations are conservative when conpared to the limits derives from the 0.173 SCPH/ diameter inch method previously described.
The leakage rate for penetrations X-37 and X-38 has been increased to 5.00 SCFH for each test. This increased leakage limit is required becauce these valves i
l will alwayn have water as a ceal during a design basis accident. This in because the Control Pod Seals form the containment boundary and not the subject valves. Both NURm-0803 and General Electric Co. report No. IMX)-24342 support this position and recommend that the cubject valves be exempted from Type-C>
tecting. Detroit Fdicon's position to test the subject valves represents extra conservatism. In addition to the above, the valve manufacturer has formally stated that the subject valves were not intended to seal against air but rather water.
During recent Type C testing of the subject valves, the best obtainable leakage -
rate subsequent to several refurbishment was 1.82 S'FU.
Discussions with Region III yielded an increase in Leakage Limit to 5.00 SCFH for each penetration.
This L*akage limit represents an achievable goal and allows for reasonable degradation with no significant increase in risk.
ALTERNATE TESTING: The Containment Isolation Valves listed in Table VR-46-R1 will be collectively leak tested according to the valve groups given in Table VR-46-R1. 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 IWV-3427 I
If the test leakage exceeds the criteria given in IWV-3427, valves in the affected group will be subject to the corrective actions of IWV-3427 on a valve by valve basis. 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.
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RELIEF REQUEST NO. VR-46-R1 Table VR-46-R1 Maximum Leakage Rates for CIV Groups Valve Maximum Penetration Valve Size Leakage
.i Number Number (IN)
(SCFH)'
X-7A B21-F022A (V17-2003) 26 B21-F028A (V17-2007) 26 25 00.*
i X-7B B21-F022B (V17-2001) 26 l
B21-F028B (V17-2005) 26 25.00
- X-70 B21-F022C (V17-2002).
26 B21-F0280 (V17-2006) 26 25.00
- X-7D B21-F022D (V17-2004) 26 B21-F028D (V17-2008) 26 25.00
- X-9A B21-F076A (V32-2002) 20 E41-F006 (V8<2194) 14 5.00 X-9B B21-F076B (V12-2001) 20 E51-F013 (V8-2228) 6 G33-F120 (V8-4615) 4 5.19 X-11 E41-F003 (v17-2021) 10 E41-F600 (V17-2088) 1 1.50 X-12 E11-F009 (V8-2091) 20 E11-F608 (V8-3407) 20 E11-F408 (V8-3874) 0 75 7.05 X-13A E11-F050B (V8-2164) 24 j
E11-F610B (V13-7688) 1 4 33 X-13B E11-F050A (V8-2163) 24 E11-F610A (V13-7687) 1 4 33 X-.15 T48-F603A (V4-2144) 4 T48-F605A (V4-2154) 4 1 38
- Pursuant to Technical Specification 3.6.1.2.C, all four main steam line penetrations (X-7A, X-7B, X-7C, X-7D) shall have a total leakage of less than 100 SCFH when tested at 25.0 psig.
RELIEF REQUEST NO. VR-46-R1 Table VR-46-R1 (Continusd)'
Maximum Leakage Rates for CIV Groups Valve' Maximum Penetration Valve Size Leakage Number Number-(IN)
(SCFH)
X-22 T49-F601 (V4-2080) 1.5 T49-F465 (V4-2079) 1.5 T49-F007 (V4-2172)
' 1. 5 0 78 X-25 T4803-F602 (VR3-3024) 24 T46-F402 (VR3-3023) 24 T46-F411 (VR3-3026) 6 9 34 X-26 T4803-F601 (VR3-3011) 24 T48-F407 (VR3-3012) 24 l'
T48-F408 (V4-2060)
'10 10.03 1
X-27a T50-401B (V5-2159) 1 X-27c T50-403B (V5-2161) 1 X-27d T50-404B (V5-2162) 1 X-27e T50-405B (V5-2163) 1 l
X-27f T50-406B (V5-2164) 1 0.85 X-27b T50-F402B (V5-2160) 1 P34-F404A (V13-7374) 0.75 0 30 X-27b T50-F402B (V5-2160) 1 P34-F403A (V13-7364) 0 75 0 30 X-31B T48-F453 (VR3-2823) 1 T48-F454 (VR3-2824) 1 T48-F455 (VR3-2825) 1 0.52 X-36 T49-F602 (V4-2188) 1.5' T49-F468 (V4-2187) 1.5 T49-F016 (V8-4140) 1.5 0.78 X-37 C11-F010 (V8-2073) 1 X-38 C11-F011 (V8-2086) 2 5.00 X-37 C11-F180 (V8-3876) 1 X-38 C11-F181 (V8-3877) 2
.5.00 X-44 T4804-F603B (V4-2143) 4 T4804-F605B (V4-2153)'
4 1 38 X-48a T50-401A (VS-2151) 1 X-48b T50-402A (V5-2152) 1 X-48c T50-403A (V5-2153) 1 X-48d T50-404A (V5-2154)
-1 X-48e T50-405A (V5-2155) 1 0.85 a-__-____-_
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1 RELIEF REQUEST NO. VR-46-R1 Table VR il6-R1 (Continued)
Maximum Leakage Rates for CIV Groups Valve Maximum j
Penetration Valve Size Leakage Number Number _
(IN)
(SCFH)
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j X-48f T50-F406A (V5-2145) 1
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P34-F403B (V13-7365) 0 75 0 30 1
1 X-48f T50-F406A (V5-2156) 1
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P34-F404B (V13-7375) 0.75 0 30 1
X-205A T23-F450B (V21-2014) 20 F23-F410 (V21-2016) 20 6.92 l
X-205B T23-F450A (V21-2013) 20 T23-F409 (V21-2015) 20 6.92 l
l X-205C T48-F404 (VR3-3013) 20 T48-F405 (VR3-3014) 20 i
T48-F409 IV4-2061) 6 7 96 X-205D T46-F400 (VR3-3015) 20 T46-F401 (VR3-3016) 20 q
T46-F412 (VR3-3019) 6 i
T48-F410 (V4-2063) 6 9.00 X-205D T48-F456 (VR3-2826) 1 T48-F457 (VR3-2827) 1 1
T48-F458 (VR3-2828) 1 0.52 X-211A E11-P0248 (V8-2136) 18 E11-F027B (V8-2158) 6 E11-F0288 (V8-2156) 18 7.26 X-211B E11-F024A (V8-2135) 18 E11-F027A (V8-2157) 6 E11-F028A (V8-2155) 18 7.26 X-215 T4804-F602A (V4-2142) 4 T4804-F606A (V4-2156) 4 1 38 X-218 T4804-F601A (V4-2140) 8 T4804-F604A (V4-2148) 8 2 77 X-218 T4804-F601B (V4-2139) 8 l
T4804-F604B (V4-2149) 8 2.77 X-219 T4804-F602B (V4-2141) 4 T4804-F606B (V4-2155) 4 1 38 l
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