ML17298B017
| ML17298B017 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 04/27/1984 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| References | |
| NUDOCS 8405170322 | |
| Download: ML17298B017 (8) | |
Text
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, IAOÃ ct'A ma.N Docket Nos.:
50-528, 50-529 and 50-530 Mr. E.
E.
Van Brunt, Jr.
Vice President - Nuclear Projects Arizona Public Service Company Post Office Box 21666 Phoenix, Arizona 85036
Dear Mr. Van Brunt:
p,pg g V 1984 DISTRIBUTION'9 pDocket File 50-528/529/530~
NRC PDR Local PDR PRC System NSIC LB&'3 Reading JLee EALicitra
- Attorney, OELD EJordan NGrace ACRS (16)
Subject:
Request for Additional Information - Palo Verde Steam Generator Tube Rupture Analysis As a result of our review of your submittal dated January 27, 1984, concerning the results of an analysis of a postulated steam generator tube rupture for Palo Verde, the staff has determined the need for additional information.
The specific 'information required is identified in the enclosed request.
The request also discusses the staff's concerns with the sensitivity of the assumptions used on the results of the analysis.
We ask that you provide responses to the enclosed request that will appropriately address the staff concerns.
Within two weeks of receipt of this letter, we request that you advise us as to when the information will be provided.
If you have any questions regarding this letter, you should contact Manny Licitra, the Licensing Project Manager.
Sincerely, g ina1SiW~
OriS "
~~@ t,en geoxSo <.
Enclosure:
As stated George W. Knighton, Chief Licensing Branch No.
3 Division of Licensing cc:
See next page DL:LB83 f D
EALicit any C I hton 4/p/84 4/p /84
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Palo Verde Hr; E.
E.
Van Brunt, Jr.
Vice President - Nuclear Proiects Arizona Public Service Company P. 0.
Box 21666
- Phoenix, Arizona 85036 Arthur C. Gehr, Esq.
Snell 8 Wilmer 3100 Valley Center Phoenix, Arizona 85073 Hr. James H. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington
- Phoenix, Arizona 85007 Charles R. Kocher, Esq. Assistant Counsel James A. Boeletto, Esq.
Southern California Edison Company P.
O.
Box 800
- Rosemead, California 91770 Hs. Margaret 'Walker Deputy Director of Energy Programs Economic Planning and Development Office 1700 'liest Washington
- Phoenix, Arizona 85007 Hr.
Rand L. Greenfield Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Pesident Inspector Palo Verde/NPS U.S. Nuclear Regulatory Commission P. 0.
Box 21324 Phoenix, Arizona 85001 Hs. Patricia Lee Hourihan 6413 S. 26th Street
- Phoenix, Arizona 85040 Regional Administrator - Region V
U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, Cali+ornia 94596 Kenneth Berlin, Esq.
Winston 5 Strawn Suite 500 2550 H Street, NW Washington, DC 20037 Hs.
Lynne Bernabei Government Accountability Project of the Institute for Policy Studies 1901 Oue Street, NW Washington, DC 20009 Jill Morrison 522 E. Colgate Templi, Arizona 85238
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ENCLOSURE '1)
'PALO VERDE UNITS 1, 2
AND 3
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RE(VEST FOR ADDITIONAL INFORMATION WITH REGARD TO SGTR ANALYSIS l.
In the SGTR analysis for Palo Verde Units submitted by your letter dated January'7, 1984, the acceptability of the radiological consequences is heavily dependent on the operator's action on
.controlling the cooldown rate.
It is assumed in the analysis that the operator has to open one ADV in each steam generator at a 10.5%
opening position to ensure a maximum cooldown rate of 75'F.
The staff notes that the. ADVs have no device to limit their opening to the assumed 10.5%,
and other calculations have shown that an opening of slightly less than 12$ would result in exceeding the 10 CFR Part 100 guideline values.
Also, there are no specific limits in either the, technical specifications or procedures to restrict opening of the ADV to less than the 10.5$ assumed.
There is only the maximum cooldown rate limit of 75'F/hr, a value that we believe is difficult for the operator to determine during a complicated event like the SGTR.
Discuss what positive measures will be taken to ensure that the assumed ADV opening position and cooldown rate will not be exceeded.
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2.
]he'GTR analysis allo assumes a cooldown rate of 30'F/hr at 30 minutes after the attempted closing of the affected steam generator ADV.
Describe how the operator monitors the plant conditions to prevent the cooldown rate exceeding 30'F/hr during this time period.
3.
Since the ADYs at Palo Verde do not have upstream block values, there would be virtually no way of isolating a stuck open ADV..
The staff believes from an overall plant safety standpoint, Palo Verde should install block valves upstream of the ADVs, per the interface requirement stated in the CESSAR System 80 FSAR.
Discuss your technical justification for a lack of the block valves, especially in light of industry experience suggesting that stuck open steam system valves-are not an uncommon occurrence.
Additionally, the Palo Verde SGTR analysis should either assume an ADV stuck in the full open position, or the applicant should provide positive assurance that the ADV cannot be opened beyond the assumed 10.55.
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