ML20136F228

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Responds to NRC Re Violations Noted in Insp Repts 50-282/85-19 & 50-306/85-18.Corrective Actions:Isolation & Restoration Procedure Required in-hand When Restoring Valves Following Maint Activities
ML20136F228
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 11/08/1985
From: Larson C
NORTHERN STATES POWER CO.
To: Shafer W
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8511220068
Download: ML20136F228 (2)


Text

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G Northem States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Telephone (612) 330-5500 November 8, 1985 W D Shafer, Chief Emergency Preparedness and Radiological Protection Branch s

U S Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 In response to your letter of October 10, 1985, concerning Inspection Reports No. 50-282/85019 (DRSS) and 50-306/85018 (DRSS), the following information is offered related to the noncompliance item cited in the report.

Violation Technical Specification 6.5.A requires that detailed written procedures for plant operations be orepared and followed.

1. Operations procedure for " Isolation and Restoration" for valves and switches involved in maintenance activities provides for identifi-cation of items (including valve number) and their respective normal status, isolation status, and verification of return to normal status.

Contrary to the above, on August 9, 1985, during the process of restoring valves to the normal status in conjunction with Isolation and Restoration Log No. J4061-WL, (following maintenance on No. 122 ADT Monitor Tank pump) valve WL-16-68, a recirculation cross-connect valve betwcen ADT Monitor Tanks No. 121 and No. 122, having a normally closed status was erroneously restored to an open status, due primarily to the failure to have a copy of the isolation and restoration procedure (which identified the normal valve status) in hand.

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2. Operations release procedures C21.1.5.1, Revision 2, " Releasing No.

121 ADT Monitor Tank to the River," and C21.1.5.2, Revision 2,

" Releasing Waste From No. 122 ADT Monitor Tank to River," in the section titled " Precautions" state that only one liquid release is to be made at a time and in Step 1.a.6, both procedures specify-that valve WL-16-68, on ADT monitor tank pump recirculation cross-connect line (between the two ADT monitor tanks) is to be checked shut prior to the release. Release instructions PINGP-39, Revision -

14, " Liquid Release Instructions," (associated with release procedure RP-123) in Part 3 requires signed approval of the Shif t Supervisor prior to initiation of a liquid release.

Contrary to the above, on August 15, 1985, a liquid release from

- No . 122 ADT Monitor Tank to the river was initiated and completed by plant attendants without verifying that valve WL-16-68 in the cross-connect line between No. 121 ADT Monitor Tank and No. 122 ADT Monitor Tank was closed. Further, since the referenced valve was open (had remained open since the improper restoration positioning on August 9,1985) and No. 121 ADT Monitor Tank Pump was in operation for recirculating the water in that tank in preparation for its subsequent release, approximately 2000 gallons of its contents were inadvertently released simultaneously with the release of No. 122 ADT Monitor Tank. Further, the 2000 gallon inadvertent release was made without required prior signed approval of the Shift Supervisor.

This is a Severity Level IV violation (Supplement I).

Response

Procedures are now in place which require having in hand a copy of the isolation and restoration procedure (which identifies the normal valve status) when making valve restorations following maintenance activities.

Valve WL-16-68 is now tagged with a SECURE card and is closed; the card requires specific approval to open the valve. The significant operating event report is being circulated among operations personnel. A letter was sent to Shift Supervisors describing the results of this inspection.

Full compliance has been achieved. Long-term corrective action calls for removal of the valve and blind-flanging of the lines.

O~

C E Lar on Vice Pres nt Nuclear Generation c: Regional-Administrator-III, NRC NRC Resident Inspector G Charnoff

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