ML19326C535
| ML19326C535 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/14/1978 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| 1-078-9, 1-78-9, NUDOCS 8004230653 | |
| Download: ML19326C535 (3) | |
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REGULAIORY INFORMATION DISTRIBUTION SYSTEM (RIDS)50-313 DISTRIBUTION FOR INCOMING MATERIAL DOCDATE: 07/14/78 REC: STELLO V ORG: WILLIAMS D H DATE RCVD: 07/19/70 AR PWR & LIGHT NRC COPIES RECEIVED DOCTYPE: LETTER NOTARI ZED: NO LTR 1 ENCL 0
SUBJECT:
INFORMATION ON REACTOR CAVITY ANNULUS SUPPLEMENT TO PREVIOUS SUBMITTAL RE:
SEAL RING AND BIOLOGICAL SHIELDING.
REVIEWER INITI AL:
XRS PLANT NAME: ARKANSAS -- UNIT 1 DISTRIBUTOR INITIAL: pq 000**************
DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS *****************a GENERAL DISTRIDUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
(DISTRIBUTION CODE AOO1)
FOR ACTION:
BR CHIEF ORB 84 BC**LTR ONLY(7)
INTERNAL:
fI REU FILE **LTR n5DP/(1)
NRC PDR**LTR ONLY(1)
OELD**LTR ONLY(1) 1 & b**LIN UNLY(2)
CORE PERFORMANCE BR**LTR ONL HANAUER**LTR ONLY(1)
AD FOR SYS & PROJ**LTR ONLY(1)
ENGINEERING BR**LTR ONLY(1)
REACTOR SAFETY BR**LTR ONLY(1)
PLANT SYSTEMS BR**LTR ONLY(1 EFFLUENT TREAT SYS**LTR ONLY.
EEB**LTR ONLY(1) d MCGOUGH**LTR ONLY(1)
EXTERNAL:
LPDR'S RUSSELLVILLE, AR**LTR ONLY(1)
TERA **LTR ONLY(1)
NSICu*LTR ONLY(1)
ACRS CAT B**LTR ONLY(16)
CONTROL NBR. _ N o2Gl!!{b DISTRIBUTION:
LTR 40 ENCL 0
/M SIZE: 2P oc*********************************
THE END 3
8004230
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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK, ARKANSAS 72203 (501) 371-4000 July 14, 1978
~"'4 US $ hf)f P
1-078-9 Director of Nuclear Reactor icgulation ATTN:
Mr. Victor Stello, Jr., Director Operating Reactors
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U. S. Nuclear Regulatory Commission f'
Washington, D. C.
20555
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Subject:
Arkansas Power 6 Light Company Arkansas Nuclear One - Unit 1 Docket No. 50-313 Reactor Cavity Annulus Seal Ring and Biological Shiciding (File:
1510, 1160)
Gentlemen:
In response to your letter dated February 2, 1978, our letter of February 22, 1978 supplied information concerning the design and storage of the concrete biological shielding and reactor cavity annulus seal ring, respectively, at Arkansas Nuclear One - Unit 1 (ANO-1).
This response supplemente our previous submittal.
As previously stated, we have concluded that the concrete biological shiciding would not become a missile during a LOCA.
In reviewing the annulus seal ring storage location during normal operation (suspended approximately three (3) feet above the refueling canal floor), we have determined that the seal ring could become a missile following a postulated reactor coolant pipe rupture inside the reactor vessel cavity.
As discussed with your Mr. Guy Vissing in a telecon on March 17, 1978, we believe the probability of occurrence for an event of the type discussed above to be sufficiently low to warrant continued operation for a short term period.
In your letter of January 25, 1978, you found two (2) years to be an acceptable short term period for resolution of the asymmetric LOCA loads issue based on the low probability of occur-rence of the same type break which must be assumed to cause the seal ring to become a missile. Therefore, no alternate method of operating is proposed at this time. We believe two (2) years to be an acceptable i
4 N A ' n ? O 9 ---
MEMBEFI MIDOLE SOUTH UTILIT1ES SYSTEM
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.s 1-078-9
. Mr. Victor Stello, Jr., Director July 14, 1978 short tem period for continued operation with the seal ring as presently stored. We will preclude the seal ring from becoming a potential missile.
prior to March,1980. We will advise you of our method of resolutioa a:
it is detemined.
Very ruly yours, s
- A.
t Daniel 11. hilliams Manager, Licensing DilW/DGM/ew r
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