ML17326B421
| ML17326B421 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 08/26/1988 |
| From: | Holahan G Office of Nuclear Reactor Regulation |
| To: | Miller H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML17326B422 | List: |
| References | |
| TAC-67797, TAC-67798, NUDOCS 8809020001 | |
| Download: ML17326B421 (4) | |
Text
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UNITEDSTATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 August 26, 1988 Docket Nos.
50-315 and 50-316 MEMORANDUM FOR:
Hubert J. Miller, Director Division of Reactor Safety Region III FROM
SUBJECT:
Reference:
Gary M. Holahan, Assistant Director for Regions III and V Reactors Division of Reactor Projects - III, IV, V
& Special Projects COMPATIBILITYOF GREASES IN LIMITOR(UE VALVE OPERATOR LIMITS SWITCHES -
DONALD C.
COOK NUCLEAR PLANT, UNITS NOS.
1 AND 2 (TACS NOS.
67797 AND 67798) TIA NO. 88-4 April 7, 1988 Memorandum from H. Miller, Region III to G. Holahan, NRR The reference memorandum requested NRR technical assistance in evaluating the effects of mixed greases on the interim operability of Limitorque operators at the D.C.
Cook Plant, Unit 1.
Enclosed is the staff Safety Evaluation.
The issue concerns Limitorque valves having mixed greases installed in the limit switches.
Workmen disassembling the operators, which were to be installed in the Unit 2 Auxiliary Feedwater (AFW) System, found a small amount of a grease (Mobilgrease
- 28) different from the bulk grease (Exxon Beacon 325).
The valves were installed in the Unit 1 AFW System without changing of the original greases provided by the manufacturer.
Since all 16 Limitorque motor operators for Units 1 and 2 were purchased simultaneously, it is suspected that the operators installed in Unit 1 could also contain mixed greases.
In Unit 2, all the affected operators will be regreased before the unit is restarted.
However, Unit 1 is currently operating and the operators cannot be regreased without shutting down the unit.
The licensee stated that Unit 1 can be safely operated until its refueling outage in early 1989.
At that time, all the affected Limitorque operators will be regreased.
CONTACT:
J.
PDC P(ol a),
As discussed in the enclosure, we have determined that adequate assurances exist that short term operability of the Limitorque valves operator limit switches will not be impaired due to the mixed greases.
Therefore, regreasing of the limit switches in the eight Limitorque motor operated valves in the AFW System of Unit 1 can be postponed unti l the next refueling outage scheduled in early 1989.
This memorandum completes our action on the subject TIA.
Enclosure:
Safety Evaluation original signed by Gary M. Holahan, Assistant Director for Regions III and V
Division of Reactor Projects - III, IV, V 5 Special Projects DISTRIBUTION~
NRC 5 LOCAL PDRs PD31 MEMO FILE GHOLAHAN JSTANG RINGRAM MCARUSO
- PREVIOUSLY CONCURRED
- LA/PD31:DRSP
- PM/PD31:DRSP RING RAM JSTANG:cr 8/25/88 8/25/88
- 0/PD31: DRSP MVIRGILIO 8/25/88 R/DRSP GHOLAHAN 8p//5 /88 D/
This memorandum completes our action on the subject TIA.
Enclosure:
Safety Evaluation Gary M. Holahan, Assistant Director for Regions III and V
Division of Reactor Projects - III, IV, V 8 Special Projects 1
DISTRIBUTION DOCKET FILE NRC 8 LOCAL PDRs PD31 MEMO FILE GHOLAHAN JSTANG RINGRAM MCARUSO
'A/PD31:DRSP P
0
- DRSP
'RIMGRAM J
8/+ /88 8/S.
/88 D/PD31: DRSP MVIRQILIO 8/gi/88 ADR/DRSP GHOLAHAN 8/
/88 D/DRSP DCRUTCHFIELD 8/
/88
As discussed in the enclosure, we have determined that adequate assurances exist that short term operability of the Limitorque valves operator limit switches will not be impaired due to the mixed greases.
Therefore, regreasing of the limit switches in the eight Limitorque motor operated valves in the AFW System of Unit 1 can be postponed until the next refueling outage scheduled in ear ly 1989.
This memorandum completes our action on the subject TIA.
Gary N. Holahan, Assistant Director for Regions III and V
Division of Reactor Projects - III, IV, V
& Special Projects
Enclosure:
Safety Evaluation