ML15264A300
| ML15264A300 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/05/1985 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| Shared Package | |
| ML15264A301 | List: |
| References | |
| GL-81-21, NUDOCS 8506190527 | |
| Download: ML15264A300 (3) | |
Text
0U 0 Dockets Nos. 50-269, 50-270 DISTRIBUTION and 50-287
-1 k File ACRS-10
~NRC PD Rlngram L PDR HNicolaras ORB#4 Rdg Gray File Mr. Hal B. Tucker HThompson EBlackwood Vice President - Nuclear Production OELD HOrnstein Duke Power Company EJordan BJones P. 0. Box 33189 BGrimes GMazetis 422 South Church Street JPartlow Charlotte, North Carolina 28242
Dear Mr. Tucker:
SUBJECT:
GENERIC LETTER 81-21, "NATURAL CIRCULATION COOLDOWN" Re:
Oconee Nuclear Station, Units 1, 2 and 3 On May 5, 1981 the NRC sent to all PWR licensees Generic Letter 81-21, "Natural Circulation Cooldown" which asked licensees to provide an assessment of their facility's procedure and training program to deal with events similar to St. Lucie's Unit 1. St. Lucie experienced natural circulation cooldown that resulted in the formation of a steam bubble in the upper head region of the reactor vessel.
By letters dated November 5, 1981, July 19, 1983 and December 12, 1984 you provided information on reactor vessel upper head steam formation during natural circulation. For natural circulation cooldown, you have developed guidelines using continuous venting of the reactor vessel upper head.
As noted in the enclosed Safety Evaluation, we conclude that for Oconee Nuclear Station, you can perform a natural circulation cooldown to Decay Heat Removal System actuation in approximately seven hours without void formation.
We recommend that these guidelines be implemented consistent with the schedule for the Abnormal Transient Operating Guidelines (ATOGS) by October 1985.
Generic Letter 81-21 requests that you provide a description of your training program that deals with the prevention or mitigation of reactor vessel voiding. We request that you"confirm and discuss the following items about your training program.
- 1. The training program addresses how voiding occurs and its consequences;
- 2. The program discusses the signs which indicate that voiding is occurring;
- 3. The program covers the procedures that prevent and mitigate voiding;
- 4. The program discusses the St. Lucie Unit 1 event of June 11, 1980, and
- 5. As part of the training, there is proper simulator modelling of upper head voiding.
9506190527 850605 P
PDR ADIOCK 05000269 P
5 PDR
Mr. Tucker
-2 We request that you provide the above information within 45 days from the date of this letter. This request for information affects fewer than ten respondents; therefore OMB clearance is not required under P. L.96-511.
Sincerely, John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing
Enclosure:
Safety Evaluation cc w/enclosure:
See next page
- RB DL B DL ORB#3:DL r
laras;cr Js KHeitner 6/q /85 6/
5 6/t/85
Mr. H. B. Tucker Oconee Nuclear Station, Units Duke Power Company Nos. 1, 2 and 3 cc:
Mr. William L. Porter Office of Intergovernmental Relations Duke Power Company 116 West Jones Street P. 0. Box 33189 Raleigh, North Carolina 27603 422 South Church Street Charlotte, North Carolina 28242 Honorable James M. Phinney Heyward G. Shealy, Chief County Supervisor of Oconee County Bureau of Radiological Health Walhalla, South Carolina 29621 South Carolina Department of Health and Environmental Control 2600 Pull Street Regional Radiation Representative Columbia, South Carolina 29201 EPA Region IV 345 Courtland Street, N. E.
Atlanta, Georgia 30308 J. Michael McGarry, III, Esq.
Bishop, Liberman, Cook, Purcell & Reynolds 1200 17th Street, N. W.
Mr. J. C. Bryant Senior Resident Inspector U. S. Nuclear Regulatory Commission Route 2, Box 610 Manager, LIS Seneca, South Carolina 29678 NUS Corporation 2536 Countryside Boulevard Mr. RbertB.
BrsumClearwater, Florida 33515 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Dr. 0. Nelson Grace, Regional Suite 220, 7910 Woodmont Avenue Administrator Bethesda, Maryland 20814 U. S. Nuclear Regulatory Commission, Region Ct 101 Marietta Street, N. W.
Suite 2900 Atlanta, Georgia 30303