ML18127A670

LER 1978-013-00 for St. Lucie Unit 1, on 03/28/78 Concerning During Shutdown for Refueling, Dose Equivalent Iodine Exceeded Technical Specification 3.4.8

ML18127A670
Person / Time
Site:	Saint Lucie
Issue date:	04/27/1978
From:	Schmidt A Florida Power & Light Co
To:	O'Reilly J NRC/IE, NRC/RGN-II
References
PRN-LI-78-121 LER 1978-013-00
Download: ML18127A670 (9)

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REGULATORY INFORMATION DISTRIBUTION SYSTEl'1 ( RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50-335 REC'REILLY J P ORG: SCHMIDT A D DOCDATE: 04/27/78 NRC FL PIJR 8( LIGHT DATE RCVD: 05/09/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR i ENCL i FORWARDING LICENSEE EVENT REPT (RO 50-335/78-i3) ON 03/28/78 CONCERNING DURING SHUTDOWN FOR REFUELINGt DOSE EQUIVALENT IODINE EXCEEDED TECH SPEC

3. 4. 8... W/ATT.

PLANT NAME: ST LUCIE 8i REVIEWER INITIAL: X JM DISTRIBUTOR INITIAL:

DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS INCIDENT REPORTS (DISTRIBUTION CODE A002)

FOR ACTION: BR C ~N/4 ENCL INTERNAL: R G FILE~~~W/ENCL NRC PDR+>W/ENCL I ~~W Ne MIPC++W/3 ENCL SCHROEDERf I PPOL I TO%4M/ENCL HOUSTON+>W/ENCL NOVAK/CHECK44W/ENCL EEB4+W/ENCL KNIGHT++WfENCL BUTI ER4+Wf ENCL HANAUER~~~l J/ENCL TEDESCO~~W/ENCL EI SENHUT+~N/ENCL BAER~~~N/ ENCL SHAO~~~W/ENCL VOLLMER/BUNCHwwW/ENCL KREGER/ J. COLL INS++WfENCL ROSA%+ltJ/ENCL K SEYFR IT/IE+4FW/ENCL EXTERNAL: LPDR S FT PIERCE( FL++W/ENCL TIC4s>W/ENCL NSIC++WfENCL ACRS CAT B4l ~W/16 ENCL

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FLORIOA POWER III LIGHT COMPANY

,April 27, 1978 PRN-LI-7 8+~21 (C (A

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Mr. James P. O'Reilly, Director, Region II Cl

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'(1 Office of Inspection and Enforcement U. S. Nuclear. Regulatory Commission C7 C7 230 Peachtree Street, N.W., Suite 1217 Cfk Atlanta, Georgia 30303

Dear Mr. O'Reilly:

REPORTABLE OCCURRENCE 335-78-13 ST. LUCIE UNIT 1

.DATE OF OCCURRENCE: MARCH 28, 1978 TECHNICAL SPECIFICATION 3.4.8.a DOSE EQUIVALENT I-131 ,~

The attached Licensee Event Report is being submitted in accordance .with Technical Specification 6.9 to provide 30-day notification of the subject'ccurrence.

Very truly yours, A. D. Schmidt Vice President Power Resources MAS/mb Attachment cc: Robert Lowenstein, Esquire Director, Office of Inspection and Enforcement (30)

Director, Office of Management Information and Program Control (3) 7813000P2 L

PEOPLE... SERVING PEOPLE

P Reportable Occurrence 335-78-13

.,Licensee Event Report Pa e two SUPPLEMENTARY INFORMATION

=TECHNICAL SPECIFICATION REPORT "DOSE EQUIVALENT IODINE

1. Reactor power history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first sam le in which the limit was exceeded Prom 3/26/78 92200 until 3/28/78 90900, the plant was at. an average steady state power of 99.5%, at, which time preparations

.for refueling shutdown were begun:

.3/28/78 81000 Rx Power 92.4%

3/28/78 81100 Rx Power 69.0%

'/28/78 91200 Rx Power 30.0%

3/28/78 '81300 Off-line (Hot.

Standby for S/G Safety Valve Testing) 3/28/78 92245* Off-line (Hot Standby for S/G Safety Valve Testing)'First Iodine Sample > 1.0 yCi/gram DEQ

2. Fuel burnu b core re ion Puel burnup by octants:

Region 1 11291.08)

Region 2 12256.19)

Average Burnup in .Megawatt Days Region R 5 11521.31) 11521 31) per Metric Ton ,'Uranium'(llHD/MTU)

Region 6 12117.92)

Region 7 11453.26)

Region 8 12212.59)

Total Core Average Burnup 11822.35 MWD/MTU

CONTROL BLOCK:

[ ASE PRINT AU. REGUIRED INFORMATION) 1 UCENSEE LCENSE EVENT NAME LCENSE NUMEEA TYPE TYPE 01 F L S L S 1 0 0 0 0 0 0 0 0 0 d 1 1 1 1 ~03 89

~

7 14 15 =25 26 30 31 32 AEPOAT AEPOAT CATEGORY SOURCE OOCKET NUMecA EVENT OATE AEPOAT OATE TYPE'OD1]OON'T L 0 5 0 0 3 3 5 0 3 2 8 7 8 0 4 2 7 7 8 7 8 57 58 59 60 61 68 69 74 75 80 I

EVENT OESCRlPTION QO 2 Durin shutdown for re'fueling, Dose Equivalent (DEQ) Iodine exceeded the Technical' 7 8 9 80 S ecification 3.4.8.a limit of 1.0 pCi/gram DOSE EQUIVALENT I-131. The DEQ Iodine was 69 tOD~] first measured above the limit at 2245 on 3/28/78 while the plant was in hot standby 7 8 9 60 g for required surveillance testing prior to continuation of the cooldown. The attached 7 8 9

[OD~} sheets contain the information required by (Continued -under ADDITIONAL FACTORS) 7 8 9 FAME 80 SYSTEM CAUSE CCMPQ RENT COMPONENT

[Og7] ~@

CODE Q

COQE

~E 7 CorrtPONENT COOE 0 E LI I I SUPPUM N C MANUF~iFER 4 9 0 VIQLATICN N

7 8 9 10 11 12 17 44 47 a8 CAUSF OESCRIPTION Qg8 After an extended eriod of ower o eration with a nominal level of fuel leaka,e, the 7 9 eo gg lant sbutdornr ttansient was sufficient to cause Iodine to build up (Iodine spiking 7 8 9

~10 7 BS ia i ca acitv for a short: eriod of time.

FACIUTY McTHQO OF 80 STATUS POWE'A OTHER STATUS OISCOVERY oiscovERY oescaipnioN Qi r ~H ~0 0 0 gee Event oesc. N/A 8 S 10 12 13 45 dt6 80 FORM OF ACTMTY CO/TENT AELcckSEO OF RELEASE AMOUNT OF ACFiVITY LOCATION OF A~OSE

~z ~z N/A 7 9 9 10 11 80 PERSONNEL EXPOSURES NUMia'EA TYPE OESCRIPTIQN

[iran] ~oo o ~z E//t 7 8 9 11 12 13 80 PERSONNEL INJURIES NUMBER CESCAIPTIQN Irr4j ~oo o N/A ~

7 89 11 12 PROpdLSLE CONSEGUENC S N/A 7 8 9 LOSS OR OAMAGE TO FACILITY TYPE OESCAIPnQN N/A 89 10 80 PUBLICITY N/A 7 8 9 ~ 80 AOOITIONAL FACTORS CG Technical Soecification 3.4.8.a. This was the first event of this type. (335-78-13).

7 89 80 fr19J 7 89 60

>f. A. Schoppman PHONE'057 552-3802 CI'0 dd'I 4 d dT

page three Re: Reportable Occurrence 335-78-13

3. Clean-up flow history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first sam le in which the limit was exceeded From 3/26/78 92200 until 3/28/78 81400, purification flow rate was -88 gpm (two charging pumps).

At 1400 on 3/28/78 a third charging pump was started, thereby raising purification flow rate to -132 gpm.

The purification flow rate was maintained at -132 gpm until the start of Shutdown Cooling (SDC) at 0430 on 3/29/78.

NOTE: Clean-up demineralization consisted of a mixed bed at a 1:1 ratio, cation to anion, in series with a straight anion bed. Bed volumes were 36 cubic feet each.

4. History of de-gassing operation'tarting 48 hours prior to the first samole in which the limit was exceeded DATE LOCATION H2% H2 (cc/k )

3/20/78 VCT gas space ,95 3/21/78 RCS dissolved gas 12.1 3/23/78 Shifted to H2 regulator on VCT cover gas.

3/24/78 RCS dissolved gas 16. 9 3/26/78 VCT purged several times with N2'.

3/27/78 VCT gas space 3/28/78 RCS dissolved gas 90045 2;.6 3/28/78 RCS dissolved gas 90930 1.7 3/28/78 VCT gas space 91800 6 3/28/78 Purged VCT with N2 92000 3/29/78 VCT gas space 1.0

Page four Re: Reportable Occurrence 335-78-13

5. .The time duration when the specific activity of the primary coolant exceeded 1.0 pCi/qram DOSE EQUIVALENT I-131.

Iodine 131 Dose Equivalent was greater then 1.0 pCi/gram from 3/28/78 92245 to 3/29/78 gll30. The total time above 1.0 pCi/gram was 12.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br />.

6. Results of S ecific Activit Anal sis (pCi/ ram)

DATE TIME I-131 I-132 I-133 DEQ 3/28/78 1500 6.7 E-1 6.7 E-1 6.7 E-1 3.1 E-1 .89 3/28/78 2245 1. 6 E-0  ?,. 6 E-1 1.2 E-0 3.2 E-1 1.91 3/29/78 0100 1. 13 E-0 9.1 E-2 8.15 E-1 1.9 E-1 l. 37 3/29/78 0420 1.23 E-0 6.5 E-2 7.8 E-1 1.5 E-1 l. 46 3/29/78 0730 9.87 E-1 3.03 E-2 5.84 E-1 8.9 E-2 l. 15 3/29/78 1130 4.99 E-1 2. 37 E-1 .56

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