IR 05000155/1992019

Ack Receipt of Transmitting Responses to Unresolved & Open Items Associated W/Insp Rept 50-155/92-19

ML20127C903
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	01/08/1993
From:	Miller H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:	Beckman W CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 9301150026
Download: ML20127C903 (2)

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JAN 8 1993 Docket No. 50-155 l

consumers Power company l ATTH: Mr. William L. Beckman Plant Manager Big Rock Point Nuclear Plant 10269 US 31 North Charlevoix, MI 49720-9436 Dear Mr. Beckman SUBJECT: RESPONSE TO UNRESOLVED AND OPEN ITEMS (URC INSPECTION REPORT NO. 50-155/92019(DRS)

This will acknowledge receipt of your letter dated December 23, 1992, in response to our letter dated October 30, 1992, transmitting the responses to unresolved and open items associated with Inspection Report No. 50-155/92019(DRS). This report summarized the results of the electrical distribution system functional inspection (EDSFI) at your Big Rock Point Nuclear Power Plant. We have reviewed your corrective actions and have no further questions at this time. These corrective actions will be examined during future inspections.

Sincerely, m;.s.fiSa w u . i C.U% Mb H. J. Miller, Director Division of Reactor Safety _

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JAf/ 8 1933 Consumers Power Company 2 Divir_ibsttisn cc: David P. Iloffman, Vice President - 11uclear Operations cc w/1tr dtd 12/23/92:

DCD/DCD (RIDS)

OC/LFDCB Resident Inspector, RIII James R. Padgett, Michigan Public Service Commission Michigan Department of Public Ilealth L. 01shan, LPM, 11RR E. Imbro, NRR Palisades SRI W. Ilodges, Region I J. Durr, Region I A. Gibson, Region II C. Julian, Region II S. Collins, Region IV T. Stetka, Region IV K. Perkins, Region V L. Miller, Region V

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Consumers William L Becktnan 1%nt Mauger POWEMING MIEHIGAN5 PROGRESS rig Rock Point Nuclear Plant,10269 Us.31 North, Charlevoix, MI 49720 December 23, 1992

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Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 000'.ET 50-155 - LICENSE DPR-6 - BIG ROCK POINT PLANT -

FULLOW-UP RESPONSE TO INSPECTION REPORT 92-019 As discussed in our letter dated November 24, 1992, Consumers Power Company was to provide a response to each of the Open and Unresolved items described in the subject Inspection Report. The attachment to this letter provides this information.

With respect to Open item (155/92019-02) concerning our ungrounded 2.4 KV electrical system, we understand that this issue is under review by the NRC and that no action is required by Consumers Power Company at this time.

Should any questions arise concerning these issues, please contact us at your convenience.

Gregory C Withrow for William L Beckman (Signed)

William L Beckman Plant Manager CC: Administrator, Region ill, USNRC NRC Resident inspector - Big Rock Point ATTACHMENT

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l l ATTACHMENT

. Consumers Power Company i Big Rock Point Plant Docket 50-155 i.

FOLLOW-UP RESPONSE 10 INSPECIl0N REPORT 92-019

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i-December 23, 1992

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' FOLLOW UP RESPONSE TO INSPECTION REPORT 92 019

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Qpfnjtem 1551R019-01 Lack of a calculation to demonstrate that the 46 kV line could maintain i adequate voltage levels during a design basis accident (DBA) with the 2.4 kV voltage regulator out of service.

Response As discussed in the Inspection Report, a preliminary calculation was performed during the Inspection which concluded this mode of operation acceptable.

A formal load flow calculation will be performed and reviewed by offsite engineering personnel to docement the acceptability of this configuration.

This effort should be completed by May 1, 1993. Within 60 days following completion of the analysis, operating procedures will be updated to advise operators that this mode of operation is acceptable.

QPSD item 155/RQ19-QA Addition of acceptance criteria to the Daily Fuel 011 Report.

Response The Daily Fuel Gil Report has been revised to address this concern. The report now provides a level for each tank at which refuel is required. A copy of the revised report is attached to this letter and we consider all actions complete.

Unr33.91ved Item 155192019-063 Calculations performed during the intpection concluded that the required NPSH for the diesel generator cooling water pump could be met at high flow rates providing signifit. ant lake level decrease or temperature increase do not occur. The Inspectors were concerned that the limits for lake level and temperature were not available to plant operators.

Response As discussed in the report, Consumers Power agreed to issue an Operations Memo to advise plant operators on the potential loss of EDG cooling water pump NPSH due to lake level. This memo was issued on September 25, 1992 and a copy is attached for your information. As stated in the Operations Memo, this guidance will remain in effect until the issue is resolved or the information is incorporated into the operating procedures.

The reason that temperature monitoring was not included in the guidance is because enhancements are in progress to improve flow characteristics and monitoring of this piping. These enhancements will be completed prior to lake water temperature increasing due to summer temperature effects. Flow characteristic improvements will mitigate the effects of warmer water on the cooling capability of this system.

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Untelolved item 155/92019-068 The team was concerned that the suction pressure acceptance criteria identified in the weekly surveillance procedure was too high to assure proper operation of the cooling water system.

l Response As discussed in the report, Consumers Power Company agreed to re analyze the ,

suction pressure acceptance criteria for the surveillance procedure. This action is complete and a copy of the revised acceptanca criteria is attached to this letter.

Unresolved item 155/92019-06C The team was concerned that suction screen cleaning was being postponed after suction pressures indicated potential plugging. Trending data showed that

=intenance orders were written when suction pressure fell outside the i pected range, but on occasion the work completion was not timely.

aesponse The surveillance procedure has been revised (copy-attached) to require high priority to maintenance orders for suction screen replacement, in addition, values are being assigned to minimum discharge pressure and maximum suction '

pressure to identify screen clogging and maintenance order generation. These values are being put in the surveillance procedure.

Open Item 155/22-019 07 During the ins)ection, wiring discrepancies between the electrical design drawings and tie as-build configuration of the EOG control panels.

Response As stated in the inspection report, the observed discreaancies did not affect-the operability of the circuits. Drawing changes have )een initiated, .

Walkdowns are ) art of the modification process and should identify any other

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deficiencies witch will_be handled on a case-by-case basis. Current

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surveillance testing insures equipment operability.

9%tn.lt9m 155]E klR-98 I

The team was concerned that control of conduit and cable tray fill l requirements was deficient and that licensee walkdowns identified some

! overfilled conduits that did not have a thermal analysis.

Response-The electrical design specification (E 8) will be revised to incorporate-

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conduit and cable tray sizing / fill instructions. The raceway schedule has i l been reviewed to identify which conduits / cable trays exceed these guidelines and evaluations are_in progress. All safety-related overfills have been resolved and the remainder will be reviewed on a case by case basis.- The target completion date for the effort is December 1993, which allows time for walkdowns in the 1993 Refueling Outage. ,

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Open item E 5L91Q)J-09 The team was concerned with the availability of design infornation to insure that installed fuses were properly selected and sized. Although an operability concern did not exist because the circuits have functioned when required, program improvements were warranted.

Response Although design information is not readily available for all fuses at BRP, it has been our philosophy to do only "like for like" replacements to insure configuration control. As discussed in the inspection Report, BRP personnel identified this concern just prior to the EDSF1 from our review of inspection results at other facilities and is in the process of establishing a arogram.

The program has a target completion date of December 1993, since wal(downs are required during the 1933 Refueling Outage.

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DAtg FUEL OIL REPORT DATE

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1. , TIMd* _ TO BE RUN ON 85' SH!rt DAILY TIME _

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_ ,HEATly0!LER FUEL OIL LEVEL AND WATER _USACES _

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CAUCE ORDER O!L WHEN WE CAN RECE!VE 7,500 CALLONS. h SPECIFIC CRAVITY s '

PREVIOUS LEVEL Heating oil must be .82$ to .887.  ;

Premium diesel oil must be .802 to .876.

PRESENT LEVEL Detain Water ** Fuel 011 ** Feed Water (FS-9502) (FI-9562p (FI.9563)

PREVIOUS CAL. Present Present Present PRESENT CAL. Previous Previous Previous DA!LY USE Daily Wkly Use Wkly Use Use _

t ErF = ritMten.calhnt E 6.44 ErP g .

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Fuel 011 Cs!1one

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_ _ _ EMERCENCY DIESEL FIRE PUMP OIL (T-$3) -

CAUCE DIPSTICK _

CQ12{Kl(18 USE PRIMIUM OIL ONLY. FULL TANK IS 44'. EMERCENCY DIESEL FIRE PUMP PREVIOUS LEVEL WILL BE DIPSTICKED THE FIRST FRIDAY OF EVERY MONTM. REFUEL AT OR ABOVE PRESENT LEVEL 26* CONTACT STOCKROOH WHEN

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EMERCENCY DIESEL CENERATOR O!L (T-83)

CAUCE DIPSTICK _

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USB PREMIUM OIL ONLY. FULL TANK PREVIOUS LEVEL IS 72* (6.0 FT). RMERCENCY CINERATOR TANK WILL DE DIPSTICKED

- THE FIRST FRIDAY OF EVERY MONTH.

RErvEL AT on AsoVs $0* (4.2 FT).*

PRESENT LEVEL M4 CONTACT STOCKROOM WHEN RECEIVINC 0.!L 311IfMENIj.

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STANDBY DIESEL CENERATOR O!L CAUCE COMMENT ORDER OIL AT OR ABOVE 34' (approx. 450 Cal.) USE PREVIOUS LEVEL PREMIUM O!L ONLY. FULL TANK IS 40". CONTACT STOCKROOH WHEN RICE!VING OIL SHIPMENTS.-

PRESENT LEVEL

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WARIHOUSE SECURITY SECURITY BOILER ASD IN OUT PREVIOUS %

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• NOTE: An alarm at the high fuel oli annunciator indicates that the tank being filled -

(T-53 or T-83) is full and refueling should be terminated.

• • HOTE: Record once por week on Monday.

REVIEWED BY SHIFT SUPERVISOR:

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e 0 0 OPERATIONS MEMO 807-92 (REV. 1)

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TO: Shift Supervisors Operators CONSUMERS POWER WJTrubilowicz

\ COMPANY PROM:

September 25, 1992 Internal DATE: Correspondence SUBJECT: DIO ROCK POINT PLANT- i EMERGENCY DIESEL GENERATOR OPERABILITY

' Shift Supervisor Log Quality Review Form CC:

control Room Log QA-05A (2)

Training Department Log DCC 740/22*07*02/L One of the concerns that hLs been raised as a result of the EDSPI deals with the ability of the Emergency Diesel Generator (EDG) to draw cooling water out of the Discharge Bay under low lake level conditions.22, 1992The length of the suction line was measured on September and it was calculated that it becomes uncovered at a lake level of ~577.1 feet above sea level.

Until the losue can be resolved, we need to monitor the actual lake level and set an operability requirement for the EDG based on lake level. This will be accomplished as follows:

On the 'C' Shift each day, take a reading on the lake Icvel instrument located in the Discharge Canal and record it on the Control Room Log Sheet.

If the lake level drops below the 578 foot elevation, the ED3 shall be declared inoperable and the three~ day LdO as specified in Technical Specification 11.3.5.3. A.2 chall apply. ,

This Operations Memo will remain in effect until the issue is resolved or this information is incorporated into the operating procedures.

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T7 28 Revision 17 Page 9 of 18 1 EMERGENCY DIESEL GENERATOR AUTO TEST START Init :Date- l

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s Olpstick Oil Level (between ADD and FULL)  !

Water Pump ',uction Vac.(PI 834) t

"flg(12. to 13.5)

Water Pump llead psig (PI 835) *(7 to'12)_

Water Pump Discharge psig (PI 836) *(8 to 13)

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1. Acceptance Criteria:

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Water Pump Discharge (PI 836) 2 6.25 psig and Water Pump Suction (PI 834) $ 14' Hg Vac -l Acceptance Criteria Met? Yes No l

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If cooling water discharge: *

• CAUTION:  !

• pressure is less than 8 psig *

• or suction pressure is greater *

• than or equal to 13.5 inches Hg.. * I,

• it may be an indication that the *

• suction strainer is.beginning- *

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• to plug. Maintenance action ,

• to clean the strainer must be- * -

• given a lllGjf priority to assure **

• the EDG will-operate properly.

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l j. If PI 836 < 8 psig or if PI 834 213.5"'Hg Vac, notiff the Shift Supervisor to' initiate a-Maintenance Order to clean the suction screen.

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