ML20207E176

Discusses Insp Rept 50-458/86-36 on 861016-23 & Forwards Notice of Violation.Violation Noted:Sys Design Bases for 10CFR50.59 Review Deficient.Civil Penalty Will Not Be Imposed Based on Prompt & Extensive Corrective Actions

ML20207E176
Person / Time
Site:	River Bend
Issue date:	12/29/1986
From:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	William Cahill GULF STATES UTILITIES CO.
Shared Package
ML20207E180	List: ML20207E176 ML20207E188
References
EA-86-183, NUDOCS 8701020081
Download: ML20207E176 (3)

See also: IR 05000458/1986036

Text

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'# "*% UNITED STATES

y' '

, NUCLEAR REGULATORY COMMISSION

$ ;f REGION IV

81s RYAN PLAZA DRIVE, SUITE 1000

ARUNGTON, TEXAS 70011

,,

DEC 2 91996

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Docket No. 50-458

License No. NPF-47

EA 86-183

4

Gulf States Utilities

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ATTN: William J. Cahill, Jr.

Senior Vice President

River Bend Nuclear Group

P. O. Box 220

St. Francisci11e, Louisiana 70775

SUBJECT: NOTICEOFVIOLATION(NRCINSPECTIONREPORTNO. 50-458/86-36)

This refers to the NRC inspection conducted of activities authorized by License

No. NPF-47 during the period October 16-23, 1986 at the River Bend Station. This

inspection consisted of a review and evaluation of the circumstances and corrective

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actions associated with the modification of the control building ventilation

system. During the inspection, a violation of NRC requirements was identified.

The inspection findings were documented in Inspection Report No; 50-458/86-36

sent to you be letter dated October 30, 1986, and an enforcement conference

was conducted November 10, 1986, at the Region IV office to discuss the violation

and your corrective actions.

As described in the enclosed Notice of Violation, plant personnel discovered

on October 16, 1986 that temporary alterations to the control building venti-

lation system had been implemented on October 29, 1985 and June 27, 1986 based

on an inadequate safety evaluation. The safety evaluation failed to recognize

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that the temporary alterations prevented the automatic start of one of tha

redundant trains of the control building ventilation system under certain single

failure scenarios. Without this automatic start capability, manual actuation

would have been required to prevent control room, switchgear room, and chiller

room temperatures from exceeding their design basis limits during a loss of

coolant accident with offsite power available. While it appears that the

inadequate evaluation had no impact on plant safety, the NRC is concerned that

your engineering review process for these modifications was deficient in

the identification of the system design bases used in the 50.59 safety evaluation.

In accordance with the " General Statement of Policy and Procedure for NRC

Enforcement Actions," 10 CFR Part 2, Appendix C (1986), the violation described

in the enclosed Notice has been classified at a Severity Level III. Normally,

a civil penalty is considered for a Severity Level III violation. However,

after consultation with the Director, Office of Inspection and Enforcement, I

have decided that a civil penalty will not be proposed in this case because of ,

the unusually prompt and extensive corrective actions taken to correct the

problem and prevent recurrence, and the licensee's prior good performance in

f- the general area of concern.

CERTIFIED MAIL - RETURN RECEIPT REQUESTED

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8701020081 861229

PDR ADOCK 05000450

0 PDR

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_ Gulf States Utilities -2- DEC29I!El

~

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 requirements.

'

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 enclosure

will_ be placed in the NRC Public Document Room. .

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 96-511.

Sincerely,

__

f!obert D. Martin

Regional Administrator

Enclosure:

Notice of Violation

cc w/ enclosure:

State of Louisiana Radiation Control Program Director