NRC Generic Letter 1980-04

NRC Generic Letter 1980-004, Transmittal of IE Bulletin 1980-001: Operability of ADS Valve Pneumatic Supply

ML031350303
Person / Time
Site:	Monticello
Issue date:	01/11/1980
From:	Keppler J G Office of Nuclear Reactor Regulation
To:
References
BL-80-001 GL-80-004, NUDOCS 8001280504
Download: ML031350303 (5)

G-go fDocket No. 50-263 1AN11 E8cNorthern States Power CompanyATTN: Mr. Dennis E. GilbertsVice PresidentPower Production andSystem Operation414 Nicollet MallMinneapolis, MN 55401Gentlemen:Enclosed is IE Bulletin No. 80-01 which requires action by you with regardto your BWR power reactor facility with an operating license.Should you have questions regarding this Bulletin or the actions requiredof you, please contact this office.Sincerely,James G. KepplerDirectorEnclosure: IE BulletinNo. 80-01cc w/encl:Mr. L. R. Eliason,Plant ManagerCentral FilesDirector, NRR/DPMDirector, NRR/DORPDRLocal PDRNSICTICJohn W. Ferman, Ph.D.,Nuclear Engineer, HPCARI E RWHe s an/bk Keppler1/11/808 00 1280 504 UNITED STATES SSINS No.: 6870NUCLEAR REGULATORY COMMISSION Accessions No.:OFFICE OF INSPECTION AND ENFORCEMENT 7912190652WASHINGTON, D.C. 20555January 11, 1980IE Bulletin No. 80-01OPERABILITY OF ADS VALVE PNEUMATIC SUPPLYOn January 10, 1980, the NRC was informed by Philadelphia Electric Company thatengineering evaluation for Peach Bottom 2 and 3 has disclosed that the AutomaticDepressurization System (ADS) pneumatic supply (either nitrogen or air) may notbe operable for all possible events because of a combination of misapplicationof check valve, a lack of leak testing of the accumulator system backing up eachADS valve operator and questions about the continued operability of the pneumaticsupply in a seismic event. Attached is a simplified schematic of the pneumaticsupply. The check valve nearest to the accumulator is a PAL, three-quarter inch,stainless steel, socket welded check valve with a hard seat (valve identification-B-1376 on the upper flange). Plant information at Peach Bottom shows substantialsupports for the pneumatic supply inside the drywell, but seismic qualificationhas not been verified. The licensee has stated that the pneumatic supply is notseismically qualified outside the drywell.Unit 2 was shutdown on 1/10/80 because of questions of ADS operability and Unit 3has been provided a seismically qualified nitrogen supply at the containmentpenetration pending confirmation of seismic qualification of piping inside Unit 2containment. The licensee is changing their valve to one with a soft seat toreduce leakage.Actions to be taken by Licensees of GE BWR facilities with an operating licensewhich use a pneumatic operator for ADS function:1. Determine if your facility has installed hard-seat check valves to isolatethe ADS accumlator system from the pneumatic supply system.2. Determine if periodic leak tests have been performed on your ADS accumulatorsystems to assure emergency pneumatic supply for the FSAR-required numberand duration of valve operations.3. Review seismic qualifications of the ADS pneumatic supply system:(a) from accumulator system isolation check valve to ADS valve operator,(b) from isolation valve outside containment up to ADS accumulator checkvalve.4. Based upon determination of items 1, 2 and 3 above, evaluate operabilityof the ADS for the conditions under which it is required to be operableincluding a seismic event. If operability cannot be established adhereto appropriate Technical Specification action statement.

IE Bulletin No. 80-01 January 11, 1980 . Provide an immediate notification to the NRC in the event the ADS is foundto be inoperable.6. Provide a response in writing by January 18, 1980, for those facilitieswhich use a pneumatic operator for ADS function.Reports should beand a copy shouldof Inspection andWashington, D.C.submitted to the Director of the appropriate NRC Regional Officebe forwarded to the U.S. Nuclear Regulatory Commission, OfficeEnforcement, Division of Reactor Operations Inspection,20555.Approved by GAO, B180225 (R0072); clearance expires July 31, 1980.given under a blanket clearance specifically for identified genericApproval wasproblems.Attachment:Sketch of ADS pneumatic supply IE BulletinJanuary 11,No. 80-011980EnclosureRECENTLY ISSUEDIE BULLETINSBulletinNo.79-O1BSubjectEnvironmental Qualificationof Class IE EquipmentDate Issued1/14/80Issued ToAll power reactorfacilities with anOL79-2879-2779-2679-25Possible Malfunction ofNamco Model EA 180 LimitSwitches at ElevatedTemperaturesLoss Of Non-Class-1-EInstrumentation andControl Power System BusDuring OperationBoron Loss From BWRControl BladesFailures of WestinghouseBFD Relays In Safety-RelatedSystemsPipe Cracks In StagnantBorated Water System AtPWR PlantsFrozen LinesPotential Failure ofEmergency DieselGenerator FieldExciter Transformer12/7/7911/30/7911/20/7911/2/7910/29/799/27/799/12/79All power reactorfacilities with anOL or a CPAll power reactorfacilities holdingOLs and to thosenearing licensingAll BWR power reactorfacilities with anOLAll power reactorfacilities with anOL or CPAll PWR's with anOL and for informationto other power reactorsAll power reactorfacilities which haveeither OLs or CPs andare in the late stageof constructionAll Power ReactorFacilities with anOperating License ora construction permit79-17(Rev. 1)79-2479-2379-14(Supplement 2)Seismic Analyses ForAs-Built Safety-RelatedPiping Systems9/7/79All Power ReactorFacilities with anOL or a CP

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