ML18114A205
| ML18114A205 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/28/1978 |
| From: | Robert E. Uhrig Florida Power & Light Co |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| Download: ML18114A205 (5) | |
Text
REGULATORY IIVFORMATIOIV DISTRIBUTION SYSTEM
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DISTRIBUTION FOR INCOMING 'MATERIAL 50-335 REC:
REID R W
NRC DOCTYPE:
LETTER
SUBJECT:
FURNISHING INFO REACTOR COOLANT ORG:
UHRIG R E DOCDATE: 04/28/78 FL PWR 8c LIGHT DATE RCVD: 0&%+>'~
~/~/m NOTARIZED:
NQ COPIES RECEIVED LTR 3 ENCL 0 CONCERNIIVG PERI"IANENT TORNADO-PROTECTED SOURCE OF WATER TO THE SYSTEI'I PLANT NAME: ST LUCIE 51 REVIEWER INITIAL:
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+++++++++++++++++ DISTRIBUTIOIV OF THIS MATERIAL IS AS FQLLOWS GENERAL DISTRIBUTION FOR AFTER ISSUANCE OF OPERATING LICENSE.
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14
iyglig FLORIDA POWER 5 LIGHT COMPANY ILNNMyIlII(gFll[MPr1 Apr'il 28, 1978 L-78-155 Office of Nuclear Rea'ctor Regulation Attention:
Mr. Robert 'W. Reid, Chief Operating Reactors Branch No.
4 Division of Operating Reactors U.
S. Nuclear Regulatory Commission Washington, D.
C.
20555
Dear Mr. Reid:
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St. Lucie Unit 1 Docket No.
50-335 Conditions of License Condition of License,I.4 for St. Lucie Unit 1 requires that a
permanent tornado-protected source of makeup water to the reactor coolant system to accommodate moderator shrinkage during plant shutdown be installed prior to startup following the first re-gularly scheduled refueling outage.
Our letters of July 7, 1977 (L-77-215) and September 23, 1977 (L-77-300) provided information to the NRC staff concerning the installation we developed to satisfy the Condition of License.
The installation consists of a permanent 2-inch line and associated valves between the Safety Injection Tank (SIT) drain line and...the Volume Control Tank (VCT),.
(See letter L-77-300).
The installation has been completed and is available for inspection by the Region II Office of Inspection and Enforcement.
Following the submittal of our earlier letters, telephone dis-cussions were held with members of the NRC staff which established the technical acceptability of our design.
We were left with the task of determining whether technical specifications were needed to ensure the availability of sufficient SIT capacity to accommodate moderator shrinkage, and, if so, we agreed to submit a proposed amendment, in order to close the issue.
The available inventory of one (of two) Boric Acid Makeup Tank (BAMT) and two (of four)
SITs is sufficient to accommodate cooldown shrinkage to an average Reactor Coolant System (RCS) temperature.;of 200 F (through opera-tional mode 4).
We have reviewed the St. Lucie Unit 1 Technical Specifications and have found that they presently require opera-bility of at least one BAMT in all operational
- modes, and require the operability of all 4 SITs in modes 1 and 2, and in mode 3
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Page two Re:
St. Lucie Unit 1 Docket No. 50-335 Conditions of License when pressurizer pressure is greater than or.equal to 1750 psia.
During heatup or cooldown, the pressurizer pressure is less than 1750 psia and the average coolant temperature is greater than 200 F for only a few hours.
The RCS is generally at reduced temperature when pressurizer pressure's less than 1750 psia.
During these:times the SITs remain operable although this is not required by Technical Specifications.
Thus, in order to have a
situation where we would not have the necessary SIT volume to accommodate moderator shrinkage, we would have to have a situation in which:
1) pressurizer pressure is less than 1750 psia and average coolant temperature is greater than 200 F
(we estimate 4 shutdowns per year, or about 32 hour3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br />s-less than 0.4%-of total available operating time),
and 2) more than two of the four SITs are unavailable when permitted by Technical Specifications, and 3) both the Refueling Water Tank (RWT) and the Primary Water Storage Tank (PWST) have been rendered in-operable by tornado.
We have never encountered such a situation and feel that the potential for having insufficient SIT makeup capacity during the short time frame when SITs would not be required operable by Technical Specifications coincident. with tornado damage to the RWT and PWST is too small to warrant unique Technical Specifications on the subject of tornado protected makeup sources.
Based on the above reasoning we have concluded that Technical Specifications addressing moderator shrinkage do not need to be issued and request that the installation of the connecting line between the SITs and the VCT be sanctioned by the deletion of Condition I.4 from Operating License DPR-67.
Very tr
- yours, obert E. Uhrig Vice President
.REU/MAS/LLL/mb cc:
Mr. Peter B. Erickson Mr. James P. O'Reilly, Region II Harold F. Reis, Esquire