ML20128D341
| ML20128D341 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 12/04/1992 |
| From: | Mccarthy D CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NLS-92-316, NUDOCS 9212070236 | |
| Download: ML20128D341 (5) | |
Text
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3 Carolins Power & t.lght Company UEC 4 1992 SERIAL: NLS 32 316 10 CFR 50.55a United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-324/ LICENSE NO. DPR-62 ASME CODE RELIEF REOUEST INSERVICE INSPECTION PROGRAM MAIN STEAM REllEF VALVE PRESSURE TEST Gentlemen:
The purpose of this letter is to request relief from the ASME Code,Section XI, in accordance with 10 CFR 50.55alg)(6)(i), for the Brunswick Steam Electric Plant. Unit No. 2. The ASME Code relief is needed to correct a condition where, dun to thermal expansion, the discharge piping for the F013L mnin steam safety / relief valve makes physical contact with a drywell spray line located inside the drywell.
To support the modification, a portion of the discharge piping for the F013L main steam safety / relief valve will be temporarily removed, reconfigured, and subsequently re installed. The ASME Code,Section XI, Subparagraph IWD-5223(f) requires a pneumatic test (at a pressure of
-L 90 percent of the pipe submergence head of water) for the relief valve piping that discharges into the containment suppression pool. The requested relief applies to the main steam relief valve discharge piping that connects between safety / relief valve F013L and the containment suppression pool. The proposed alternate testing (vulumetric weld examination) will provide adequate assuiance of the integrity of the affected piping.
The detailed relief request is provided in Enclosu e 1. Approval c' this relief request is needed by January 15,1993 in stepport of the Brunswick Unit No. 2 start up scheduled for March 1993.
Similar requests for the Brunswick Steam Electric Plant, Unit Nos.1 a.id 2 were submitted by CP&L letters dated February 26,1992 (Seriah NLS 92-046) and August 15,1991 (Serial: NLS-91-198),
eespectively and were approved by NRC letters dated July 22,1992 and October 29,1991, respectively.
Please refer any questions regarding this submittal to Mr. D. B. Waters at (919) 546-4661.
Yours very truly,
,Cf 7 D. C. McCarthy 07n07o
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t ENCLOSURE 1 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 NRC DOCKET NO. 50 324 OPERATING LICENSE NO DPR 02
- ASME CODE RELIEF REQUEST INSERVICE INSPECTION PROGRAM MAIN STEAM RELIEF VALVE PRESSURE TEST 1.
ALTJJLCADt E COMPONENTS This relief request applies to the main steam relief valve discharge piping that runs between safety / relief valve F013L and the containtnent suppression. pool. A portion of the piping between safety / relief valve F013L and the containment suppression pool will be removed and subsequently re installed.
11.
[MPRACTICAL TEST REOUIREMENT t
i e Technical Specifications for the Brunswick Steam Electric Plant, Unit No. 2 state that enservice inspection of ASME Code Class 1,2, and 3 components shall be performed in accordance with the requirements of the applicable edition and addenda of the ASME Code,Section XI except where specific written relief has been granted by the Commission pursuant to 10 CFR 50.55a(g)l6)(i). The Section XI Code edition and addenda applicable to the Grunswick Steam Electric Plant, Unit No. 2 are the 1980 Edition with Addenda through the Winter 1981.
The ASME Code,Section XI, lWA 4000 provides requirements for repairs to pressure retaining components. IWA 4400(a) requires the performance of a system hydrostatic test in accordance with IWA 5000 following welding repalts. IWA 5214(a) and IWA 5214(b) require the pressure test reonirements comply with IWD-5223 for Class 3 components. IWD 5223(fl.
requires a pneumatic test (at a pressure of 90 percent of the pipe submergence head of water)
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for safety or relief valve piping which discharges into the containment pressure suppression -
poolin lieu of a system hydrostatic test.
Ill.
BASIS FOR REllLE A condition has been identified where, due to the4 mal expansion, the discharge piping for the F013L main steam safety / relief valve makes physical contact with a line associated with -
drywell spray. A plant modification is needed to re-route portions of the discharge line for the _.
f013L main steam safety / relief valve To support the modification, a portb o, the discharge ~
piping for the F013L main steam safety / relief valve will be temporarily removed, reconfigured,
!i and subsequently re installed as shown in the attached isometric drawing from.the Engineeringi Evaluation Report (Exhibit 'A). The affected discharge piping is located in the drywell portion of the primary containment.
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As described above, subparagraph IWD 5223(f) of the ASME Code,Section XI requises a
. pneumatic test at a pressure of 90 percent of the pipe submergence head of water (i.e.,
2.8 psi), The centerline of the tee-quencher for the relief valve discharge piping is 7.25 feet below the high water levelin the containment suppression pool. Therefore, the test pressure corresponding to 90 percent of the pipe submergence head of water, as required by the ASME Code,Section XI, subparagraph IWD-5223tf), is 2.8 psi.
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e Performance of the pneumatic pressure test will require disassembly of the F013L safety / relief valve in order to pressurize the piping to the 2.8 pH test pressure and perform the examination. The design pressure and temperature for the piping is 450 psig and 500 degrees F. The test pressure required by IWD-5223(f) (i.e.,2.8 psi) is significantly lower than the design pressure of the piping and the operating pressure typically experienced by the piping; therefore, the Company does not believe the IWD 5223(f) test provides assurance of the integrity of the piping. In addition, the potential exists for inadvertently damaging the f013L safetv/ relief valve during the performance of the test. Thereforo, the Company believes the test requirement is impractical and requests relief in accordance with 10 CFR 50.55algl.
IV. ALTERNATE TESilNG The field wolds will be examined to the most stringent optional requirement of the ASME Code, Section Ill, Class 3 (i.e., using RT examination). Based on t.he alternate testing, it is highly improbable that a weld that passes a volumetric examination willleak at a test pressure of 2.8 psi (a test pressure of 90 percent of the pipe submergence head of water)..
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