ML20079L406
| ML20079L406 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 10/31/1991 |
| From: | Beck G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9111060266 | |
| Download: ML20079L406 (5) | |
Text
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a l o Cim s o. v,a l'lill.ADELi'lilA EIECTitlC COMI'ANY NUCLEAR GROUP lil?ADQUARTERS 955-65 CHESTERIIROOK BLVD.
WAYNH, PA 19087-5691 (215) 640-6000 NUClf AR (;NGINI.l; RING & $l:RVICl3 [Ef%5d Ml'NT October 31, 1991 Docket Nos. 50-352 60-353 License NoJ. NPF-39 NPF-85 U.S.
Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Subject:
Limerick Generating Station, Units 1 and 2 Relief Request for the First Ten Year Interval Pump and Yalve Inservice Testing (IST) Program Gentlemen:
Attached for your review and approval is Relief Request No.
GPRP-4 for the Limerick Generating Station (LGS), Units 1 and 2, First Ten Year lnterval Pump and Valve Inservice Testing (IST)
Program.
Relief Request No. GPRR-4 requests relief from the American Society of Mechanical Engineers ( AS?!E) Boller and Frcanure Vessel (D&PV) Code Section XI, Subbection lWP r& uirement that instrumentation to measure pump inlet pressure hau ch accuracy of i 21 of full scale, and requests NRC approval to ung the primary containment suppression pool level inntru, mentation to determine pump inlet pressure.
This Relief Request applies to the Residual Heat Removal, Co';h Spray, and Safeguard Piping Fill systems.
The suppression pool provides the source of water to supply the pumps associated j
With these systems.
We prepose to use installed suppression pool lovel instrumentation which has an auuracy of 1 1.1% of full scale to determine pump inlet pressure in lieu of using the installed pump suction pressure instrumentation which does not meet the ASME B&PV Code required accuracy of 1 2% of full scale.
In order for us to meet the Code accuracy requirements for
-inservice testing, test gaugen would need to be installed.
Installing and removing these test gauges is not desirable since it would require repeated breaching of an chgineered safety featuro' pressure retaining component and could result in the spread of radioactive contamination within the Secondary j
Containment.
If 911i060266 911031
\\
PDR ADOCK 050003'32 h
P PDR l
iU.S.-11uclear Regulatory Cohmisalon October-- 31, 1991-Doctiment ControLDg}:
Payg_2 On August 27, 1991, during a conference call with j
reprenantatives from the NRC regarding LGS IST related issues, l
we briefly discussed the details of this Relief Request and indicated that this Relief Request would be submitted to the 11RC for_ review and approval in the near future.
We would appreciate your cooperation in providing an-expeditious review of this Rollef Request so that we may avoid the potential of spreading radioactive contamination during inservice testing of those pumps.
If you have any questions or require additional information, please-do not hesitate to contact us.
Very truly yours,
,r$lbf l:
G.
J.
Beck Manager Licensing Section httachment cc:
T.-T.
Martin, Administrator, USNRC, Region I (w/ attachment)
T. J.
Kenny, USNRC Senior Resident-Inspector, LGS (w/ attachment)
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ATTACHMENT Relief Request No, GPRR-4 for the Limerick Generating Station Units 1 and 2 First Ten Year Interval Pump and Value Inservice Testing (IST) Prograin
LOS 1 & 2e IST Progpc:
Sp;c. HL-008 App:ndix B Page 1 of 2 RELIEF REQUEST HO. GPRR-4, REVISION O PUMPISlf Residual Hent Removal 1AP202 2AP202 IBP202 2BP202 1CP202 2CP202 1DP202 2D?202 Core Spray 1AP206 2AP206 iBP206 2BP206 1CP206 2CP206 IDP206 2DP206 Safvouned Pipino fill I AP2%
2AP256 1BP256 2PP256 TESTING REQUIREMENT (Sit Pump irle i pressure shall be measured as spect find in ASME Saction XI ibsection IHP Article IHP 3100.
BASIS FOR RELIEFt PLCo rroposes to mnasure pump inlet pr e,usu r e by using suppression pool level indica tors because pump suc tion is directly from the suppra.nsion pool and the level is monitored on a daily surveillance in'.erval.
Determining inlet prnnsure based on supprossion pool levnl is required because the permanently installed suction pres,sure in 'ruments exceed the ranum requirements speci fied in IHP-4120.
The installed instruments, which orn pressurn boundary Q, are required to assess system performanen during plant conditions other than inservice testing.
Thereforn, to moet Il*P-4120 ranco requirements for innervice testinu, test cauons would have to be used.
Installation and removal of test cauons is not dar.ireable because it requires the repeated breaching of a
contaminated system on a sectica of prnssure boundary 9 piping.
Accurate indicati7n of pump rouc t i on pressure can be daterminad using thn installed suppression pool loval inetrumentation.
This instrumenta tion, which is used to sa'tisfy Technical Speci fi ca t i on ECCS operability requitemonts, is accurate to within 11.1% of full-scale and ments the range requiremento specified in lHP-6120 (23 foot water gauan referenen valun, 0 - 50 foci water nuus j
full-scalo).
The followino example illustrains that usina suppression nool 1 = vel instrumentn tion to datermine pump inlet pressure msnts the Code occuracy requirements, e
i ExamtdnL.ln1RnuaDL.Elpi.ng_ fill.f umn T he pump ref erence inlet r., essurn is 11.7 psi, be. sed on the dif ference between the suppression pool level and the pump inint. Therefore, using instrumenta tion tha t meets Code requirements ( full-scale is 35.1 psi and 12% accuracy)'the tolerance would be 10.7 psi nnd thn indicated accure.cy is !6% of the reference valua which would be the maximum allowed by the Code.
Using the existino suppression pool level instrumentation with a full-scale ranun of 0 - 50 fact water oauge (wg) that is calibrated to 11.1%
full scale, the instrument tolerance is 10.5 font wp, or f0.26 psi.
The suppression pool instrument tole-anen of 10.26 psi is better than the Cada required necuracy.
LGS.1 & 2, IST Prcgram Spsc. HL-008 App 2ndix B Page 2 of 2 RELIEF REQUEST NO. GPRR-4, REVISION 0 (cont'd)
L'y na mi c, losses are considered in the pump performance r
baseline and should remain approximately constant throughout plant life.
Additionally. suppression pool atmooheric pressure contributions (approximately 0.2 to 0.5 psi ) will be acenunted for by mathema tically correctino for theva contributions in the surveillance tests.
ALTERNATE TESTINGt Suppressisn pool l e'r e l instr umentation with an accuracy of 11.1% os full-scalo will be used to determine numn inlet pressure.
/lo alternato testing will be performad.
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