A09805, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0070 Complete.Comments Encl

Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0070 Complete.Comments Encl

ML20091P929
Person / Time
Site:	Millstone
Issue date:	09/27/1991
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Hehl C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20091P903	List: A09698, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0162 Complete.Comments Encl A09701, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0166 Complete.Comments Encl A09703, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0165 Complete.Comments Encl A09755, Informs That Review of Issues Re Employee Concerns for Allegations RI-91-A-0172 & RI-91-A-0173 Complete.Comments Encl A09768, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0079 Complete.Comments Encl A09803, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0183 Complete.Comments Encl A09805, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0070 Complete.Comments Encl A09806, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0171 Complete.Comments Encl A09807, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0170 Complete.Comments Encl A09819, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0163 Complete.Comments Encl A09829, Informs That Review of Issues Re Facility Activities for Allegation RI-91-A-0210 Complete.Comments Encl A09850, Informs That Review of Issues Re Employee Concerns for Allegation RI-91-A-0229 Complete.Comments Encl
References
A09805, A9805, NUDOCS 9202040091
Download: ML20091P929 (4)

Text

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P O DOx210 H Ant F on0. CONNECTICUT 06141-0210 k L J UU Ei..C). 7, G0h 605 6000 September 27, 1991 Docket No. 50-336

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A098155 RE: Employee Concerns 4

i Mr. Charles V. Hehl, Director Division of Reactor Projects U. S. Nuclear Regulatory Commission Region I 475 Allendale Road Kit.g of Prussia, Pennsylvania 19406

Dear Hr. Hehl:

Hillstone Nuclear Power Station, Unit NO. 2 RI-91-A-0070 i

Ve have completed out reviev of identified issues concerning activities at Hillstone Station. As requested in your. transmittal letter, our response or safeguards dces. not. contain eny personal privacy, proprietary, information, The material contained in these reJponses muy be released to the public and placed in the NRC Public Document Room at your discretion, '

The NRC transmittal letter and our response have received controlled end limited distribution on a "need to knov a -basis during the preparation of this response. Additional time _ in which to respond to these issues var granted by the Region I Staf f in a telephone conversation on September 19

-1991-ISStlE 70-1:

During a recent condenser backvashing evolution on April 12-13, 1991 the "C" circulating vater pump vas tri.' ped by operators. Concurrently, the "D" circulating vater pump inadvertently tripped. A plant incident report was not vritten describing this event. .In addition, during the past refueling outage (October 1990) a similar event occurred with no subseqt.cnt plant incident report.

Request:

Please discuss the validity of this assettion. If a plant incident Please report discuss vas. required, please discuss vhy one vas notand viitten.

if so, why it- vas not whether this incident has occurred previously, documented via a plant incident report.

9202040091'911106 PDR ADOCK 05000336

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l Hr. Charles V. H:hl, Directer l U. S. Huelcar R0gulatory Ccmaissicn

' A09805/Page 2 September 27, 1991

Response

on In stating that the 'D' circulating vater pump inadvertently tripped April 13, 1991, the assertion is valid. In implying that a Plant Incident Nor is the Report (PIR) vas required, the assertion is not valid.

assertion valid in stating that a similar problem occurred in October 1990.

A plant incident report (PIR) vas not necessary for the April 13, 1991 puwp trip as the pump vas restarted and aIntrouble reviewing report was submitted to Shift Supervisor (S$)

investigate the reason for the trip.

logs from October 1990, ve find no record of a similar pump trip.

The PIR program at Hillstone Station is controlled by Administrative Control Procedure (ACP) ACP-0A-10.01 - Plant Incident Report. The purpose of the PIR is to document any situatior, that requires the involvement of The guidance given is plant that management or reporting to an external agency.a PIR should be initiated if in th management action or cognizance is required to resolve the incident.

The underlying theme of the PIR procedure is succinctly phrased in the final sentence of Section 1 of the ACP: "If in doubt, it is better to initiate a PIR than to allov a problem to go unattended." The decision to issue a PIR is sometimes clear cut (as in instances where PORC-approved procedures requite that a PIR be written) but is frequently a judgment call on the part of the on-duty Shift Supervisor. The Shift Supervisor is assisted in such decisions by the guidance in ACP-0A-10.01 and consultation with the Operations Manager or the Unit Duty Officer.

cir c. pump at 0025 on April 13, Relative to the unexpected trip of the "D" 1991, there ate two criteria given in the ACP vhich might applys

d. Any near miss that could have resulted in a plant trip / scram...

e. Recurring fallutes of plant equipment that have a significant ef fect on plant reliability or operability.

Clearly these tvo criteria involve judgment on the part of the Shift Supervisor, and it is reasonable to have for the Shift Supervisor on the mid-shift decided against a PIR, and to ask the DutyA on April 13, 1991, of ficer and Operations Manager in the morning whether a PIR vas desired.

Trouble Report (TR) on the condition was submitted,Inand the pump trip vas response to the TR, a discussed with management the folloving morning.

f aulty timer vas identified and corrected by Generation Test Services.

Background

In the refuel outage of 1990, Generation Test Services, during routine The timer was testing, identified a bad timers timer vere the 'D' tocire.

instarting pump.

f all, replacement timers repaired and since the vere ordered. The timers ordered in late 1990 vere received in the spring of 1991 and one vas used to replate the timer that f ailed in the C pump in

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Hr. Charlos V. II;hl, Director U. S. Nuclear Regulatory C:ssissien

c. A09805/Page 3 September 27, 1991 early April 1991. Vendor information concerning an expected 10-year service life which was provided in response to the order, resulted in our establishing a preventive maintenance program to ensure that these timers are replaced after being in service for 8 years.

Vhile ve vere avare of the pump trip at issue ve vere not svare that this was a concern until receipt of the NRC transmittal letter.

ISSUE 70-3b l

It was noted, during a preventive maintenance on the spare botic acid pump  !

motor located in the varehouse, that the motor heaters were not energfred l

to keep the vindings at least $ degrees F above ambient as is required on i the PH card.

Requestt Please discuss the validity of this ascertion. Please discuss actions taken to ensure the proper petformance .: PHs on equipment in storage.

Responset The assettion as stated is valid. Ve vere informed of this issue via a note on the preventive maintenance (TH) Automated Vork Order (AVO) which vas completed on April 4, 1991. The note indicated that the 0 PM vas unsatisfactory because the motor casing temperature vas not $ F above the ambient temperature due to the fact that the motor heaters vere not energized.

On April 8, 1991, an AVO vas generated to make the necessary connections to energire the motor heaters for the spare boric acid pump motor. The work vas completed on May 30, 1991. The delay in completing the work resulted from moving the motors near enough to a pover source that could be used to energire the heaters.

For the July 3, 1991, preventive maintenance performed on the spare boric acid pump motor (AVO H2-90-16027), the motor had been relocated, the motor heaters vere energized and the FH vas completed satisf actorily with no outstanding items.

Vhen equipment such as the pump in question is received on site it is stoted in varehouse facilities qualified for storage of Category I electrical equipment in accordance vit,h the requirements of ACP-0A-4.04-Instructions for Packaging, Shipping, Receiving, Storage, and Handling.

Equip 3ent is placed in the PH program to ensure that the proper maintenance is carried out until it is placed in service. That the vindings vete not energized as soon as the pump vas received and placed in storage vas an oversight which vas corrected by the PH program.

Mr. Charles V. Elehl, Director U. S. !!uelear Regulatory Commission

' A09805/Page 4 September 27, 1991 The resistance readings recorded during each of the FM activities indicated Based on that the sotor insulation resistance vas within specifications.

the storage environment and the insulation resistance readings, there is reasonable assurance that there van no deleterious effect on the motor from being stored with its motor heaters de-energized. As can be seen from the above chronology, ve completed all appropriate actions to ensure the opersbility of the boric acid pump prior to receipt of your letter on this matter.

After our reviev and evaluation of this issue, ve find that these issues Ve did not present any indication of a compromise of nuclear safety.

appreciate 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 COMPAMY

t. J. nye u "HV i 2W Senior Vice President cc t - V. J. Raymond, Senior Resident inspector, Hillstone Unit Nos. 1, 2, and 3 E. L. Jenzinper, Chief, Projects Blanch No. 4 Division of Reactor Proj ec ts E. H. Felly, Chief, Reactor Projects Section 4A J. T. Shediosky, NRC, Hillstone Nuclear Power Station

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