A09806, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0171 Complete.Comments Encl

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Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0171 Complete.Comments Encl
ML20091P983
Person / Time
Site: Millstone Dominion icon.png
Issue date: 10/03/1991
From: Mroczka E
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To: Hehl C
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20091P903 List:
References
A09806, A9806, NUDOCS 9202040113
Download: ML20091P983 (3)
v • d • e


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f  ; 'j:5 C'l2"!!'.C'1 tro31 M s-sooo 1 1 L t October 3, 1991 Docket No. 50-336 A09806 Re: Employee Concerns Mr. Charles W. Hehl, Director Division of Reactor Projects U.S. Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406

Dear Mr. Hehl:

Millstone Nuclear Power Station, Unit No. 2 RI-91-A-0171 an identified issue concerning activities at We have corr-leted our review of Hillstone Station. As requested in your transmittal letter, our response does The not contain any personal privacy, proprietary, or safeguards information.

material contained in this response may be released The to the public ar.d placed NRC transmittal let-in the NRC Public Document Room at your discretion.

ter and our response have received controlled and limited distribution Additionalon a tine "need-to-know" basis during the preparation of this response.the Region 1 Staff in a in which to respond to this issue was granted by telephone conversation on September 19, 1991.

ISSUE 0171:

"A concern has been received regarding the performance of preventive mainte-nance on the Main Exhaust Portions Fan of the 74C circuit, control motor andwhichitsincluded circuit brecker time delay (Refstrence AWO M2-90-06778).

systems T01, TD2, and TD3, were energized after safety tags were placed on June 24, 1991 (Reference Tags 2-1323-91). The work order caution note ' Multi-pie Power Supplies' should have caused the Operations Department personnel to completely _ isolate all power supplies."

REnUEST:

"Please discuss the validity of the above assertion. If deficiencies tre found to be of a generic nature, please notify us of the corrective actions Pleate provide es with an assessment of you have taken to prevent recurrence.

the safety significance of any identified ce'iciencies,

)

I 9202040113 911tos l' DR ADOCK 05000336-FDR

Mr. Charles W. Hehl A09806/Page 2 October 3, 1991 The caution note at issue appears on the computer generated Automated Work in establishing the tag Order (AWO) to assist the Operations Department boundaries and to caution the Job Supervisor that circuits may be energized.

The note was not intended as a flag for the Operations Department to ensure The objective of the note was to that all power sources are de-energized.

prompt a discussion of the tagging boundaries before the work is begun so that The note on the proper work method and tagging boundaries can be established.

the AWO and a similar note on the tag sheet are indications that not all the circuits have been de-energized.

The electrical schematic for Hain Exhaust f an, E34C, indicates that there are De-energizing F34C by opening interlocks between all three Main Exhaust fans.

the power supply circuit would not de-energize all of the contacts associated with the*e interlocks. In addition, there are contacts associated with annun-ciator and logic circuits which would remain energized af ter opening the f an power supply circuit breaker. from a plant operations standpoint it would not be practical to de-energize all the Main Exhaust fans simultaneously; there-fore, no additional tagging was provided for the work.

If after discussion with and rev"w by the Operations Department additional tagging is not practical or cannot be provided, either of the following alternatives could have been agreed upon:

1. Obtain permission from the Control Room to remove the starter from the cubical and complete the PM activity.
2. Perform the work using proper safety equipment and devices. As a minimum, when working on or near energized equipment of 750 volts or below, elec-tricians are instructed to wear low voltage gloves and safety glasses. _

If neither of the above is acceptable, the option remains for an individual to stop the job and inform the Electrical Maintenance Supervisor of any concerns.

Department policy has been that any individual not feeling that maintenance can be performed safely on equipment with some auxiliary contacts remaining energized is not to work on jobs that he does not believe are safe. No one has been pressured to work with energized circuits.

Since the procedures and guidance are in place to support the above discus-sion, there are no deticiencies in the tagging procedures and no corrective action is required. Since the work can be performed safely by following the electrical maintenance guidance, and no one is pressured to work on energized circuits, there is no adverse impact on safety.

I After our review and evaluation of this issue, we find that this issue did not present any indication of a compromise of personnel or nuclear safety. We were not aware of this issue prior to the receipt of the NRC letter. We appreciate

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.L Mr. Charles- W.l Hehl A09806/Page 3 October 3, 1991 the opportunity to respond and explain the basis of our actions. Please ,

contact my- staff if there are further questions on any of these matters.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY >

Edwipf'J. roc Sen Wr Vice Pr sident cc: W. J. Raymond, Senior Resident inspector, Millstone Unit Nos. ,1, 2, and 3 E. C. Wenzinger,- Chief Projects Branch No. 4, Division of Reactor

-Projects E. M. Kelly, Chief, Reactor Projects Section 4A J. -T. 'Shediosky, U.S. Nuclear Regulatory Comission, Millstone ,

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