ML19208B063
| ML19208B063 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/17/1979 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Proffitt W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| REF-GTECI-A-09, REF-GTECI-SY, TASK-A-09, TASK-A-9, TASK-OR NUDOCS 7909190010 | |
| Download: ML19208B063 (3) | |
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UNITED STATES
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AUG 171979 Occket No. 50-339 Mr. W. L. Proffitt Senior Vice President - Power Operations Virginia Electric & Power Company P. O. Fox 26666 Richmond, Virginia 23261
Dear Mr. Proffitt:
SUBJECT:
licERIM ACTIONS flEEDED FOR PLANT GPERATION PENDING FINAL RESOLUTION OF' ANTICIPATED TRANSIENTS WITH FAILURE TO SCRAM (ATWS) - (NORTH ANNA PJWER STATICU, UNIT NO. 2)
In Decwber 1978 the Nuclear Regulatory Comission (NRC) staff issued Volune 3 of NUREG-0460 which describes the proposed type of plant modifications the staff belieren are necessary to reduce the risk frem antici' pated transients with failure to scram ( ATWS) to an acceptable level. The MC's Regulatory Requireaents Review Ccmittee completed its review in January 1979, ano concurred with the staff's approach described in Volume 3 of NUREG-0460 insofar as it applies to the North Anna Powr Station, Unit No. 2. The. staff has issued requests for the industry to supply generic analyses to confirm the ATWS mitigation capability described, '
in Volume 3 of NUREG-0460.
Subsequentl'y, the: staff plans to present its recomnendations for rulemaking on ATUS to the Comission. The Comist.icn wculd, s
by rulemaking, determine the required modifications to resolve ATWS concerns and the requirad schedule for the implerrentation of such modifications. The3 North Anna Power S'ation, Unit No. 2 would of course, be subject to the Comission!s decision in this riatter.
Based on censideratiorc escribed in pages 42 through 45,'Volune 3.cf NUREG-0460, the staff generally concluded that plants with operathig licenses can continue to operate without undue risk to the healthian.i rafety of the putlic during the estimated 2 to 5 year period needed to irplement the necessary modifications.
However, the staff believes the following stepsi shouj'd be taken as a prudent course prier to the issuance of an operating licenw in order to further feduce the risk from ATWS events during the interim' period before the required plant modifications as determined by the Comission are cernpleteo.
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Mr. W. L. Proffitt AUG 171979 e
1.
Emergency procedures should be developed to train operators to recognize an ATWS event, including consideration of scram indicators, rod position indicators, flux monitors, pressurizer level and pressure indicators, pressurizer relief valve and safety valve position indicators, coolant average temperature, containment temperature and pressure indicators, steam generator level, pressure and flow indicators, and any other alarms annunciated in the control room including alanns not processed through the electrical portion of the reactor scram system. The emergency procedures should be sufficiently simplified and unambiguous to permit prompt ATWS recognition.
2.
The operator should be trained to take actions in the event of an ATWS including consideration of manually scrarming the reactor by using the manual scram buttons, prompt actuation of the auxiliary feedwater system to assure delivery of thc ';11 capacity of this system, and initiation of turbine trip. These actions must be taken immediately following the occurrence of the event. The operator should also be trained to promptly initiate boration by actuation of the high pressure safety injection system to bring the plant to a safe shutdown condition.
We will require that you submit your procedures for our review by September 14, 1979. Our review will include a visit to your plant to determine 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 for the North Anna Power Station, Unit No. 2.
Si
- erely,
/ieven A.\\arg'a, Acti g Assistant
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Director for Light h-
'r Reactors Division of Project Management cc : See next page 3
Mr. W. L. Proffitt 0U6 I 7 I979 cc: Mr. Anthony Gambaradella Cl arence T. Ki pps, Jr., Esq.
Office of the Attorney General 1700 Pennsylvania Avenue, fi.W.
11 South 12th Street - Room 308 Washington,D. C.
20006 Ricrynond, Virginia 23219 Ca rroll J. Savage, Esq.
Richard M. Foster, Esq.
1700 Pennsylvania Avenue, N.W.
211 Stribling Avenue Washington,D. C.
20006 Charlottesville, Virginia 22903 Mr. James C. Cunstan Michael W. Maupin, Esq.
State Corporation Comission Hunton, Williams, Gay & Gibson Comonwalth of Virginia P. O. Box 1535 Blandon Building Richmond, Virginia 23212 Richmond, Virginia 23209 Mrs. June Allen Alan S. Rosenthal, Esq.
412 Owens Drive Atomic Safety and Licensing Appeal Board Huntsville, Alabama 35801 U.S. Nuclear Regulatory Comission Washington,D. C.
20555 Mr. James Torson 501 Leroy Michael C. Farrar, Esq.
Socorro, New Mexico 87801 Atomic Safety and Licensing Appeal Board U.S. Nuclear Regulatory Commission Mrs. Margaret Dietrich Washington, D. C.
20555 3
Route 2, Box 568 Gordonsville, Virginia 22942 Dr. John H. Buck i
Atomic Safety and Licensing Appeal Board Willian H. Rodgers, Jr., Esq.
U.S. Nuclear Regulatory Comission Georgetom University Law Center Washington, D. C.
20555 600 New Jersey Avenue, N.W.
Washington,D. C.
20001 Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Comission Mr. Peter S. Hepp Washington, D. C.
20555 J '.
Executive Vice President
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Sun Shipping & Dry Dock Company Mr. Michael S. Kidd P. O. Box 540 U.S. Nuclear Regulatory Conaission y'
Chester, Pennsylvania 19013 P. O. Box 128 Spotsivania, Virginia 22553 Mr. R. B. Briggs Associate Director Dr. Paul W. Purdom 110 Evans Lane Department of Civil Engineering Oak Ridge, Tennessee 37830 Drexel University Philadel phia, Pennsyl vania 19104 a
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Mr. W. L. Proffitt AUG I 7 1979 cc:
Dr. Lawrence R. Quarles Apartment No. 51 Kenda l-a t-Long wood Kennett Square, Pennsylvania 19348 Fr. Irwin B. Kroot Citizens Energy Forum P. O. Box 138 McLean, Virginia 22101 James B. Dougherty, Esq.
Potomac Alliance P. O. Box 9306 Washington, D. C.
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