ML20056H511
| ML20056H511 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 08/26/1993 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Mccoy C GEORGIA POWER CO. |
| References | |
| TAC-M84932, TAC-M84933, NUDOCS 9309090461 | |
| Download: ML20056H511 (6) | |
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August 26, 1993 L
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i Docket Nos. 50-424 and 50-425 1
Mr. C. K. McCoy Vice President - Nuclear Vogtle Project Georgia Power Company P. O. Box 1295 Birmingham, Alabama 35201
Dear Mr. McCoy:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING ALTERNATE MINIMUM FLOW LINES IN THE HIGH HEAD SAFETY INJECTION SYSTEM - V0GTLE NUCLEAR GENERATING PLANT, UNITS 1 AND 2 f
(TAC NOS. M84932 AND M84933)
The NRC staff is reviewing your letter of February 18, 1993, providing your operability assessment of the alternate minimum flow lines in the high head safety injection system at Vogtle. We find that the additional information regarding surveillance of the associated valves is needed for completion of this review. The additional information is requested in the enclosure.
Your written response to the enclosure is requested within 45 days of receipt of this letter.
If you have questions regarding the enclosure or are unable to meet the requested response date, contact me at (301) 504-3049.
This requirement affects fewer than ten respondents, and therefore, is not subject to Office of Management and Budget review under P.L.96-511.
Sincerely,
/s/
Darl S. Hood, Senior Project Manager Project Directorate 11-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
i Request for Additional Information cc w/ enclosure:
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WASHINGTON, D.C. 20555-0001 August 26, 1993 Docket Nos. 50-424 l
and 50-425 Mr. C. K. McCoy Vice President - Nuclear i
Vogtle Project
+
Georgia Power Company P. O. Box 1295 l
Birmingham, Alabama 35201
Dear Mr. McCoy:
i
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING ALTERNATE MINIMUM FLOW LINES IN THE HIGH HEAD SAFETY INJECTION SYSTEM - V0GTLE NUCLEAR GENERATING PLANT, UNITS 1 AND 2 (TAC NOS. M84932 AND M84933) t The NRC staff is reviewing your letter of February 18, 1993, providing your operability assessment of the alternate minimum flow lines in the high head safety injection system at Vogtle..We find that the-additional information 3
regarding surveillance of the associated valves is needed for completion of-
)
this review.
The additional information is requested in the enclosure.
Your written response to the enclosure is requested within 45 days of receipt t
of this letter.
If you have questions regarding the enclosure or are unable to meet the requested response date, contact me at (301) 504-3049.
l This requirement affects fewer than ten respondents, and therefore, is not subject.to Office of Management and Budget review under P.L.96-511.
]
Sincerely, ye / o e Darl S. Hood, Senior Project Manager
'l Project Directorate II-3 Division of Reactor-Projects.- I/II Office of Nuclear Reactor Regulation
Enclosure:
-i Request for. Additional l
Information l
i cc w/ enclosure:
j See next page j
i i
I.
1 l
Mr. C. K. McCoy Georgia Power Company Vogtle Electric Generating Plant cc:
Mr. J. A. Bailey Harold Reheis, Director Manager - Licensing Department of Natural Resources Georgia Power Company 205 Butler Street, SE. Suite 1252 P. O. Box 1295 Atlanta, Georgia 30334 Birmingham, Alabama 35201 Attorney General Mr. J. B. Beasley Law Department General Manager, Vogtle Electric 132 Judicial Building Generating Plant Atlanta, Georgia 30334 P. O. Box 1600 Waynesboro, Georgia 30830 Mr. Alan R. Herdt Project Branch #3 Regional Administrator, Region II U. S. Nuclear Regulatory Commission U. S. Nuclear Regulatory Commission 101 Marietta Street, NW. Suite 2900 101 Marietta Street, NW., Suite 2900 Atlanta, Georgia 30323 Atlanta, Georgia 30323 Mr. Dan H. Smith, Vice President Office of Planning and Budget Power Supply Operations Room 615B Oglethorpe Power Corporation 270 Washington Street, SW.
2100 East Exchange Place Atlanta, Georgia 30334 Tucker, Georgia 30085-1349 Office of the County Commissioner Charles A. Patrizia, Esquire Burke County Commission Paul, Hastings, Janofsky & Walker Waynesboro, Georgia 30830 12th Floor 1050 Connecticut Avenue, NW.
Mr. J. D. Woodard Washington, DC 20036 Senior Vice President -
Nuclear Operations Art Domby, Esquire Georgia Power Company Troutman Sanders P. O. Box 1295 600 Peachtree Street Birmingham, Alabama 35201 NationsBank Plaza Suite 5200 Atlanta, Georgia 30308-2210 Resident Inspector U. S. Nuclear Regulatory Commission P. O. Box 572 i
Waynesboro, Georgia 30830 j
l
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I t
I ENCLOSURE NRC STAFF POSITIONS AND REQUEST FOR ADDITIONAL INFORMATION ON VALVE SURVEILLANCE FOR THE ALTERNATE MINIMUM FLOW LINE, V0GTLE ELECTRIC GENERATING PLANT UNITS 1 AND 2
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Each train of the Alternative Minimum Flow (AMF) lines in the High Head Safety Injection (HHSI) system contains a spring-actuated valve that is designed to self-actuate when AMF flow is required. The normal practice for valves of l
this general design would be to categorize them as relief type valves and, as such, to test their set pressure at a nominal five-year or ten-year testing frequency in accordance with Section XI of the ASME Code. However, the NRC staff has determined that these valves perform safety functions by opening to l
assure adequate flow in the AMF lines, and by closing to assure integrity of the HHSI system. Moreover, the valve's control functions of (1) opening to prevent the HHSI pumps from deadheading following a safety injection signal and (2) closing to assure adequate HHSI flow for emergency core cooling, have a significant effect on overall plant safety.
i Because these relief / control valves have performed poorly at some plants during various system actuations and tests, the NRC staff has determined that in order to assure these safety functions, testing should be performed more frequently than would be required for relief valves whose function is that of system overpressure protection. Moreover, the NRC staff has determined that, as a minimum, these valves should be tested to assure operational readiness as follows:
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(1)
At least one of the valves should be set pressure tested each fuel i
cycle.
Both valves should be tested within two fuel cycles.
(2)
If one valve fails a set pressure test, the other valve should be tested.
P (3)
An immediate assessment of valve operability should be made following any system actuation requiring valve discharge, including a visual inspection and verification of reseating. Both valves should then be set pressure tested, inspected and refurbished as necessary at the next shutdown of sufficient duration to perform these activities.
j With respect to the above NRC staff positions, we request the following
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additional information i
1.
In your letter of February 18, 1993, you committed to perform testing of the AMF relief / control valves at a frequency which agrees with NRC staff
. positions (1) and (2) above until you consider the increased testing frequency is no longer necessary.
Please identify all requirements and acceptance criteria that you will use to determine that the incraased l
l
F
- 4. :. s i testing frequency is no longer necessary. Alternatively, revise your comitment to indicate that this testing will continue until the NRC staff approves otherwise.
2.
Please indicate your intentions with respect to the assessment, testing, inspection and refurbishment as stated in NRC staff position (3) above.
G
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l LETTER DATED:
Anoust 26. 1993 Distribution:
Docket File NRC PDR Local PDR PDII-3 R/F Vogtle R/F S. Varga 14-E-1 G. Lainas 14-H-1 l
D. Matthews 14-H-25 L. Berry 14-H-25 D. Hood 14-H-25 OGC-WF 15-B-18 ACRS (10)
P-315 E. Merschoff Region II G. Hammer 7-E-23 l
J..Norberg 7-E-23 l
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