ML20136B253
| ML20136B253 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 11/15/1985 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| ULNRC-1210, NUDOCS 8511200165 | |
| Download: ML20136B253 (5) | |
Text
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u,== mcmic c 1901 Grotlot Street, St. Louis Donald F.Schnell November 15, 1985 Vice President Mr. Harold R. Denton, Dir(ctor Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory C )mmission Washington, D. C. 20555
Dear Mr. Denton:
ULNRC-1210 DOCKET NUMBER 50-483 CALLAWAY PLAUT, UNIT 1 CALLAWAY LICENSE CONDITIONS C(12)
References:
- 1) ULNRC-1003 d.ited December 28, 1985
- 2) NRC Letter f t:om B.
J. Youngblood to D.
F.
Schnell dated July 30, 1985 Callaway License Condition C(12) deals with the use of Residual Heat Removal (RHR) suction relief valves for Low Temperature Over-Pressure Protection (LTOP).
In Reference 1 Union Electric proposed a modification to add an alarm circuit to valves BB-PV-8702A and EJ-HV-8701B.
The alarms will provide assurance that the RHR system is properly isolated from the Reactor. Coolant System (RCS) when th,e plant is returned to operating pressure following use of the RHR relief valves for l
LTOP.
NRC subsequently approved this modification in Reference 2.
During the course of completing the detailed design of this modification it was determined the modification as proposed in Reference 1 would perform its intended function, but would produce alarms that could not be cleared, even with correct valve alignment.
This is because the alarms would be generated above the interlock activation setpoint of 682 psig, when power was removed from the valves, as procedurally required.
In order to remedy this situation, Union Electric proposes modified alarm circuits which will alarm only if either valves BB-PV-8702A or EJ-HV-8701B is open at pressures above the interlock setpoint.
A single annunciator window will represent these two alarm circuits, but they will be alarmed individually on the Balance of Plant Computer.
The newly proposed alarm circuits do not affect the analysis provided in Reference 1 with regard to compliance to Standard Review Plans 5.2.2 and 5.4.7 and the corresponding Branch Technical Positions RSB 5-2 and 5-1.
In the previously approved design, valve position was provided indirectly by an auxiliary relay at the motor control center and was therefore not available when power was removed from the valves.
The newly proposed g
circuits are an improvement due to this design not relying on pp 8511200165 851115 S
DR ADOCK 05000483 PDR Moiling Address-RQ Box 149, St. Louis MO 63160
. This is power to the valve actuator to provide the alarm.
because the valve position inputs for the alarms now come directly from valve stem mounted limit, witches and power is An alarm response procedure provided by the annunciator system.
will direct the operator to verify valve closure upon receipt of
.The attached sketch depicts the alarm circuits which this alarm.
are currently proposed.
License Condition C(12) established an implementation schedule of 1 year following NRC approval.
The newly proposed alarm circuits require new cables be run to the valves in containment and therefore require an outage to complete that portion of the modification.
The only scheduled outage for Callaway prior to July 30, 1986 is the Refuel-1 outage which will begin on March 1, 1986.. Work to be performed during Refuel-1 is in the final stages of planning and therefore NRC approval of this-modification is requested by December 1,1985.
We regret that additional effort on your part will be required to close License Condition C(12), but we do appreciate Enclosed is a check for an expeditious review of this request.
the $150.00 application fee required by 10 CFR 170.12.
If there are any questions, please contact us.
Very truly yours, Y
A D g,schnell DS/bjk L#
STATE OF MISSOURI )
)
-CITY OF ST. LOUIS )
Robert J.
Schukai, of lawful age, being first duly sworn upon' oath says that he is General Manager-Engineering (Nuclear) for Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By Robe t J. Schukai
-Gener
.ger-Engineering Nuclear SUBSCRIBED and sworn to before me this /8 day of 198f
- 0. b BARBARANAF NOTARY FUBUC, STATE OF MISSOURI MY COMMISSION EXPlRES APRIL 22. 1983 ST. L0ulS COUNTY
i+-
cc: ~ Gerald Charnoff, Esq.
Shaw, Pittman, Potts & Trowbridge 1800 M.
Street, N.W.
Washington, D.C.
20036 Nicholas A.
Petrick Executive Director SNUPPS 5 Choke Cherry Road Rockville, Maryland 20850 G..C. W'right Division of Projects and Resident Programs, Chief, Section lA U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Little
~Callaway Resident Office U.S. Nuclear hegulatory Commission
~RRil Steedman, Missouri 65077 Tom Alexion Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission
. Mail'Stop P-316 7920 Norfolk Avenue Bethesda, MD 20014 1
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