ML18110A888

LER 1977-335-22 for St. Lucie, Unit 1 Atmospheric Steam Dumps

ML18110A888
Person / Time
Site:	Saint Lucie
Issue date:	04/21/1977
From:	Schmidt A Florida Power & Light Co
To:	Moseley N NRC/IE, NRC/RGN-II
References
LER 1977-335-22
Download: ML18110A888 (3)

Text

P 0 BOX 013100 MIAMI'L33101 FLORIDA POWER & LIGHT COMPANY April 21, 1977 PRN-LI-77-118

~o -~M Mr. Norman C. Moseley, Director, Region Office of Inspection and Enforcement II U. S. Nuclear Regulatory Commission 230 Peachtree Street, N. W., Suite 1217 Atlanta; Georgia 30303

Dear Mr. Moseley:

REPORTABLE OCCURRENCE 335-77-22 ST. LUCIE UNIT 1 DATE OF OCCURRENCE: APRIL 8, 1977 ATMOSPHERIC STEAM DUMPS The attached Licensee Event Report is being submitted in accordance with Technical Specification 6.9 to provide prompt notification of the subject occurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/cpc Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (40)

Director, Office of Management Information and Program Control (3)

CONTROL BLOCK: (PI E PRINT ALL REQUIRED INFORMATION)

LCENSEE UCENSE EVENT NAME LICENSE NUMBER TYPE TYPE F L S L S 1 0 0 0 0 0 0 0 0 0 4 1 1 1 1 ~01 89 14 15 25 26 30 31 32 REPORT REPORT CATEGORY 100NT~ TYPE T

SOURCE L 0 5 DOCKET NUMBER 0 0 3 3 5 0 4 EVENT DATE 0 8 7 7 0 4 REPORT DATE 2 2 7 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION 2

8 9 D s ies have shown t at the installed atmos heric steam dum valves do not meet eo 3 the criteria of FSAR section 10.3.2 for cooldown to the shutdown coolin window. This 8 9 80 4

8 9 ob em ik 1 event that offsite ower is unavailable for 80 5 eriod of time thereb removin the main condenser as the normal heat sink.

8 9 80 6 e such conditions cooldown to the shutdown coolin window can be achieved b 8 9 PRME 80 SYSiiM CAUSE C MPONKNT C MPONENT COOK CODE COMPONENT CODE RPPLXR I ANVF~iRER

~HJ ~B V A L V E Z A W 2 5 5 N 8 9 10 11 12 17 47 CAUSE OESCRIPTION The cause of this occurrence was a desi n error in the sizin of the atmos heric steam 8 9 dum valves 2 valves . Corrective actions bein considered are: 1 increase the 8 9 size of he valve internals 2 re lace the resent valves with lar er valves and 8 9 80 FACILITY METHOD OF STATUS POWER OTHER STATUS DISCOVERY OSCOVERY DESCRIPTION 8 9

~0 ~oo 10 0 NA 44 En ineerin Desi n Review 12 13 45 80 FORM OF ACTIVITY COATKNT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE z ~z NA NA 8 9 10 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

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'I1

~z NA 8 9 12 13 80 PERSONNEL INJURIES DESCRIPTION 4 0 0 0 NA 8 9 11 12 80 ROE~LE CONSEQUENCES NA 8 9 80 LOSS OR OAMAGE TO FACIUTY TYPE O ESCROW N Z NA 89 10 80 PUBLICITY NA 8 9 .60 AOOITIONAL FACTORS P o for continuation of Event Descri tion and Cause Descri tion.

8 9 80 89 80 BiABBe. N. A. RrhnnnmRn one. /~c~

REPORTABLE OCCURRENCE 335-77-22 LICENSEE EVENT REPORT PAGE TWO

,EVENT DESCRIPTION (Continued) augmenting the relieving capacity of the atmospheric steam dumps as described in the Cause Description. This is the first reportable occurrence at St.

Lucie Unit 1 involving a deficiency in the steam dump capability.

(335-77-22)

CAUSE DESCRIPTION (Continued)

(3) re-evaluate the design of the Shutdown Cooling System (SDC) to determine if transition to SDC can take place at a higher temperature. Until the atmospheric steam dump capacity deficiency is corrected, the following interim procedures have been instituted: (1) upon loss of offsite power with 116,000 gallons in the condensate storage tank, immediately commence boration and cooldown, (2) when cooling down concurrent with a loss of offsite power, use the secondary steam dump system at about 400 F RCS temperature when condensate storage tank level is below 116,000 gallons, and (3) administratively maintain condensate storage tank level at or above 210,000 gallons to minimize the need to use the secondary steam dump system. A followup report will be submitted when the final corrective action has been determined.