ML20125A843
| ML20125A843 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 11/30/1992 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9212090082 | |
| Download: ML20125A843 (6) | |
Text
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't)ukikvr Company 1CAln wn;
- 4fcGuirr Nuclear GeneraCnq Department ~
Mce President i
- 12700 Hagers ferry Road (A!C014)-
. (TO4)S?S 461V Hurnersville, NC280?8-83S5 --
- (701)R75409Fu
' DUKE POWER
+
November 130,-_1992 I
U.
S. Nuclear Regulatory Commission Attentiont. Document Control Desk Washington, D. C.
20555 1
Subject _:
McGuire Nuclear-Station, Unit 1 Docket Nos. 50-369 Inservice-Inspection,.Section XI l
.Second Interval, Unit-1 Relief. Request 92-05 3
Dear Sir; Pursuant to 10 CFR 50.55a(g)(5)(111), I am submitting the attached relief request for NRC review and approval. --This request-for> relief from ASME Code requirements involves:
the Unit 1 safety-related; snubber selection plan: required by-Section XI during the-second~ interval.
A copy _of,the Inservice Inspection plan that will berused-during the.
second interval.for McGuire Nuclear-Station, Unit 1 was=
provided by my letter dated October 12,~1492; For your information, a-similar relief::requestJwas approved-
~
by the NRC'for both units-during'thelfirstointerval.. This:.
approval is documented within aiMarch:26,'1985 NRC letter.-
~Should there beiany' questions regarding this-matter,fplease-t contact Paul.Guill-at (704) 875-4002.
Very truly yours, Of
'Ted C. McMeekin l
Oh033 9212090002 921130 l'
PDR ADCCK.05000369.
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11uclear llogulatory Commisalon l-tiovember 30, 1992 i -
page 2 l
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Mr.
S.
D.
Ebne t.o r llogiorial Administrator, Region II U.
S. tiuclear Roguintory Commission 101 Mariotta Stroot, NW, Suito 2900 A t. l a n t a, Georgia 30323 Mr.
P.
Y,.
Van Doorn Senior liRC 'tosident Inspector, Muduiro McGuiro 14uclear St.ation Mr. T.
A.
Il o o d, Project Manager offico of Nuclear Reactor Regulation U.
S. tiuclear llogulat.ory Commission Ono White Flint. North, Mail Stop 9M3 l
Washingt on, D.C.
20555 John C.
Brooks, Commissioner of Labor At t.ont. ion t Director, Boller & Pressure Vossol Division Dopartment of Labor State of North Carolina 4 West. Edonton Stroot naleigh, North Carolina 27601
.m i
.v U. S. ifuelear Regulat ory Commission November 30, 1992 pago 3 l
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xc with attachment i
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Sharpo L. J. Kunka P. T. Vu P.
F. Guill T. D. Curtis R. B. Travis R. E. Itall W. 11. Taylor B. !!. !!amilton J. W.
Boyle R. D. Klein (MG01MM)
J. O. Darbour (NS)
J. M.
Boughman (NS)
J. E. Cherry (NS)
A. J.
110gg0 (NS)
G. J. Underwood (NS)
R. L. Gill,jr (Na)
- 11. A. Froobo (NS. [F110:MC-001.01)
Files 801.01
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ATTACHMENT DUKE POWER COMPANY MCGUIRE NUCLEAR STATION Roguest for Relief From ASME Code Soction XI Requiromonts 1.
Component for Which Relief is Roquested A.
Namo and Identification Number All safety-related snubbers for Unit 1 B.
Function Snubbers are designed to prevent pipe motion under dynamic loads.
C.
ASME Section XI Codo Class Provides support for Class 1, 2 and 3 systems D.
Valve Category Not Applicable ASME Codo Section XI Requirement That Has Been Determined To II.
Be Impractical ASME Boiler and Pressure Vessel Code Section XI, 1986 Edition, Article IWF-5000
III. Basis for Roquesting_Rollef The McGuiro Nucioar Station Technical Specification (TS)
Surveillance Requirement 4.7.8 states that each snubber required L"
'+chnical Specification (TS) 3.7.8 be operable by perf or-c.; en augmented inservice inspection program (as specifier 7 3 4. 7.8a-1).
Part of this augmented inspectim c:sgram (TS 4.7.80), requires that during the first refueling shutdown and at least once per refueling thereafter, a representative sample of snubbers be tested using one of threo stated samplo plans.
In addition to the above TS requiremont, TS 4.0.5 requires that the rules of ASME Boiler and Pressure vessel Codo Section XI be followed.
Whereas TS 4.7.80 permits for the selection of one of the three sampling plans for snubber functional tests, the ASME Codo Section XI has only one samp11Dg plan to follow.
Prior to 1980, the A;ME Codo Section XI and Generic Standard TS sampling plan requirements woro identical.
That is, the Generic Standards TS specified only one plan and it was identical to what was specified by section XI.
In the 1980 revision of the Generic Standard TS, up to dato operating experience and design practicos were used as a basis for the three sampling plans, one of which is identical to che Section XI plan.
By a letter dated February 14, 1984, Duke notified the NRC that sample plan number 2 for the functional testing of snubbers would be performed during the first McGuiro Unit I refueling shutdown.
This plan involves functionally testing a representativo sample of snubbers in accordance with TS Figure 4.7.1.
Since this 'lan for snubber selection differs from that specifiec 1 Section XI of the 1986 Edition of the ASME Code, relief from the requirements of this portion of the ASME Code is requested.
The code requiroment to perform-functional testing on 10%
of the total number of snubbers, with subsequent samples of an additional 10% if any snubber fails the test, is The impractical for stations with largo number of snubbers.
consequences of using the 10% sample plan would lead to excessive radiation exposures, an increase in reinstallation errors, additional manpower requirements, and possibly extended outages due to the probability of being-required to test 100% of the snubber population.
Alternate sampling as outlined in the McGuire TS, will provide a 95%
The NRC has reviewed these alternate plans and has found them acceptable.
Due to the problems of dealing with such a largo population of snubbers as required under the 10% plan, we would anticipato an actual decrease in the level of safety provided.
McGuire Units 1 and 2 have a total population of approximately 2500 safety related snubbers.
IV.
Altornato Tosting Safety-related snubbers will be functionally tested por plan number 2 of the alternative plans in the McGuire TS 3/4.7.8,0.
V.
Implementation Schedulo McGuire safety-related snubbers will continue to be functionally tested por the requirements of the TS.
W
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