IR 05000263/1986004

Forwards Insp Rept 50-263/86-04 on 860528-0905 & Notice of Violation.Violations Involve Inoperability of Both Trains of Standby Liquid Control Sys During 841102-860611.Violation Considered Significant Because of Time Violation Existed

ML20215D374
Person / Time
Site:	Monticello
Issue date:	12/11/1986
From:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Larson C NORTHERN STATES POWER CO.
Shared Package
ML20215D377	List: IR 05000263/1986004 ML20215D405
References
EA-86-165, IEC-77-09, IEC-77-9, NUDOCS 8612160343
Download: ML20215D374 (4)

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DEC 1 1 1986 Docket No. 50-263 License No. DPR-22 EA 86-165 Northern States Power Company ATTN: Mr. C. E. Larson Vice President, Nuclear 414 Nicollet Mall Minneapolis, MN 55401 Gentlemen:

SUBJECT: NOTICE OF VIOLATION (NRC INSPECTION REPORT NO. 50-263/86004)

This refers to the inspection conducted during the period May 28 - September 5, 1986 at the Monticello Nuclear Generating Station of activities authorized by NRC License No. DPR-22. The inspection included a review of the circumstances associated with a violation identified by your staff and reported to the NRC on June 12, 1986. The violations involved the inoperability of both trains of the Standby Liquid Control (SLC) System during the period November 2,1984 -

June 11, 1986. The violations, the causes, and your corrective actions were discussed during an enforcement conference in the Region III office between you, Mr. Dennis Gilbert, and other members of your staff and Mr. A. B. Davis and other members of the Region III staff on September 25, 198 The violations in the enclosed Notice of Violation (Notice) are considered significant because of the time the violations existed prior to their correctio Violation A in the Notice resulted from the incapability of both trains of the SLC System of providing injection flow upon initiation from the control roo Because of the failure to ensure that electrical fuses were properly coordinated, the actuation of the SLC system explosive valves caused the firing circuit to be shorted. The short caused the electrical circuit breaker for the control power to the SLC pump motor to trip, thereby tripping the pump and rendering the SLC system inoperable. This deficiency was revealed during testing of the SLC system on June 11, 198 Violation B in the enclosed Notice involves the failure to assure that timely and effective corrective actions were taken after the potential for this problem was identified to your plant management by the NRC, General Electric, and your plant engineering personnel. This matter is of particular concern because the NRC sent to you IE Circular 77-09, Improper Fuse Coordination in BWR Standby Liquid Control System Control Circuits, dated May 27, 1977 to alert you to this specific problem. In addition, on August 6, 1977, General Electric sent to you Service Information Letter (SIL) 236, Fuse Coordination in SLC System, which addressed the fuse coordination problem. Had your plant staff followed the diagnostic tests recommended by this 1977 SIL, this problem could have been 8612160343 861211 PDR ADOCK 05000263 0 PDR j

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Northern States Powe Company DEC 1 1 1986

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identified and corrected in that time period. Furthermore, your plant engi-

'neering personnel did recognize.that-the fuse coordination problem existed as early as March 1979. However, a design change was never implemented because your staff-concluded that the probability of shorting both detonators in both squib valves was . low; therefore, the design change was assigned a low priority with years of delay at various stages of the design' change process. It was not until after the testing failures on June 11, 1986 that corrective measures were take ~In accordance with the " General Statement of Policy and Procedure for NRC-Enforcement Actions," 10 CFR Part 2, Appendix C (1986), the violations described

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in the enclosed Notice have been classified as a Severity Level III proble The base civil penalty for a Severity Level III violation or problem is $50,00 .However, after consultation with the Director, Office of Inspection and Enforce-ment, I have decided that-a civil penalty will not be proposed in this cas Although you had been previously notified of the potential for this problem, this problem appears to be an isolated case and you have prior good performance in this general area of concern. However, it is significant that you had man opportunities to correct this problem considering its duration and that you had knowledge of the potential for this problem to exist. Future violations of this type will result in civil penalty enforcement actio You are required to respond to this letter and should follow the instructions specified in the enclosed Notice when preparing your response. In your response, you should document the specific actions taken and any additional actions you plan to prevent recurrence. After reviewing your response to this Notice, including your proposed corrective actions, the NRC will determine whether

'further NRC enforcement action is.necessary to ensure compliance with NRC regulatory requirement In accordance with Section 2.790 of the NRC's " Rules of Practice," Part 2, Title 10, Code of Federal Regulations, a copy of this letter and its enciesures will be placed in the NRC Pubite Document Roo .

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Northern States Power 3 Company DEC 1 1 1986 The responses directed by this letter and the enclosed Notice are not subject to the clearance procedures of the Office of Management and Budget as required by the Paperwork Reduction Act of 1980, PL 96-51

Sincerely, MIS.IMS$

dans s. Kappier

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James G. Keppler Regional Administrator Enclosures: Notice of Violation Inspection Report No. 50-263/86004(DRP)

cc w/ enclosures:

W. A. Shamla, Plant Manager Licensing Fee Management Branch Resident Inspector, RIII Monticello Resident Inspector, RIII Prairie Island John W. Ferman, Ph.D.,

Nuclear Engineer, MPCA RII RIII RIII RIII p\n .h Y No ma Schultz Davis K p' er l2+86 4; f/fG i 9.96

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Northern States Power 4 '

Company EC 11 1986 t

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PDR LPDR SECY CA JTaylor, IE JKeppler, RIII ABeach, IE

_HWong, IE JLieberman, OGC

' Enforcement Coordinators RI, RII, RIII, RIV, RV EA File ES File

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