ML19254B065
| ML19254B065 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 08/17/1979 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Wofford A LONG ISLAND LIGHTING CO. |
| References | |
| REF-GTECI-A-09, REF-GTECI-SY, TASK-A-09, TASK-A-9, TASK-OR NUDOCS 7909240024 | |
| Download: ML19254B065 (4) | |
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AUG 171979 Docket No.: 50-322 Mr. Andrew W. Wofford Vice President Long Island Lighting Company 175 East Old Country Road Hicksyflie, New York 11801
Dear Mr. Wofford:
SUBJECT:
INTERIM ACTIONS NEEDED FOR PLANT OPERATION PENDING FINAL RESOLUTION OF ANTICIPATED TRANSIENT WITH FAILURE TO SCRAM (ATWS)
(Shoreham)
In December 1978, the Nuclear Regulatory Comission (NRC) staff issued Volune 3 of NUREG-0460 which describes the proposed type of plant modificaticns the staff believes are necessary to reduce the risk from anticipated transients with failure to scram (ATWS) to an acceptable level. The NRC's Regulatory Requirements Review Comittee completed its review in January 1979, and concurred with the staff's approach described in Volume 3 of NUREG-0460 insofar as it applies to Shoreham. The staff has issued requests for the industry to supply generic analyses to confirm the ATWS mitigaticn capability described in Volume 3 of NUREG-0460. Subsequently, the staff plans to present its recomendations for rulemaking on ATWS to the Comission. The Comission would, by rulemaking, detemine the required modifications to resolve ATWS concerns and the required schedule for the implementation of such modifica:icns. Shoreham would, of course, be suoject to the Comission's decision in this matter.
Based on considerations aescribed in pages 42 through 45, Volume 3 of NUREG-0460, the staff generally concluded that plants with operating licenses can continue to operate without adue risk to the health and safety of the public during the estimated 2 to 5 year period needed to implement the necessary modifications.
However, in addition to our licensing requirement for a recirculation punp trip to mitigate the short-tem consequences of ATWS events, the staff believes the following steps should be taken as a prudent course prior to the issuance of an operating license in order to further reduce the risk from ATWS events during the interim period before the required plant modifications as detemined by the Comission are completed.
1.
Emergency procedures should be developed to trair operators to recognize an ATWS event, including consideration of scram indicators, rod position indicators, average powsr range flux monitors ( APRM), reactor vessel level and pressure indicators, relief valve and isolation valve indicators, and containment temperature, pressure and radiation indicators. The procedures should be sufficiently simple and unambiguous to pemit prompt operator recognition of an ATWS event.
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Mr. Andrew W. Wofford AUG
- 43 2.
The operator should be trained to take actions in the event of an ATWS including consideration of manually scramming the reactor by using the manual scract buttons followed by changing the operation mode switch to the shutdown position, stripping the feeder breakers on the reactor protection system power distribution buses, scracming individual control rods from the back of the ' control room panel, tripping breakers from plant auxiliary power source feeding the reactor protection system, and valving out and bleeding off instrment air to scram solenoid valves.
These actions must be t4 ken innediately after detection of an ATWS event.
The operator should also be trained to promptly place the residual heat removal system in the suppression pool cooling mode to reduce the severity of the containment conditions; and actuate the standby liquid control system if a scram cannot be made to occur.
Early operator action as described above, in conjunction with a recirculation ptmp trip, would provide significant protection for some ATWS events, namely those which occur (1) as a result of coccon mode ft!1ure in the electrical portion of the scram system and some portions of the drive system, and (2) at low power levels where the existing standby liquid control system capability is sufficient to limit the pool temperature rise to an acceptable level.
We require that you submit your procedures for our review. Please submit them by October 19, 1979. Our review will include a visit to your plant to detennine the feasibility of implementing your proposed procedures through operator simulation of the steps. Our evaluation must conclude that acceptable procedures and operator training are in place prior to the issuance of an operating license.
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abga Ac sistant even.
Director for Light ater Reactors Division of Project Management cc: See next page
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gs. I W9 Long Island Lighting Company ccs:
Howard L. Blau, Esq.
Blau and Cohn, P.C.
217 Neeridge Road Hicksville, New York 11801 Jeffrey Cohen, Esq.
Deputy Comissioner and Counsel New York State Energy Office Agency Building 2 Empire State Plaza Albany, New York 12223 Energy Research Group, Inc.
400-1 Totten Pond Road Waltham, Massachusetts 02154 Irving Like, Esq.
Reilly, Like and Schnieder 200 kest Main Street Babylon, New York 11702 J. P. Novarro Project Manager Shoreham tOclear Powr Station P. O. Box 618 Wading River, New York 11792 W. Taylor Reveley, III, Esq.
Hunton & Williams P. O. Box 1535 Richmond, Virginia 23212 Ralph Shapiro, Esq.
Cammer & Shapiro No. 9 East 40th Street New York, New York 10016 Edward J. Walsh, Esq.
General Attorney.
Long Island Lighting Company 250 Old Country Road Mineola, New York 11501 O
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