ML20024B737

LER 83-011/03L-0:on 830605,circuit Breaker for Boron Injection Tank Heater Channel B Tripped.Caused by Component Failure Due to Normal End of Life.Failed Heater Replaced. W/830705 Ltr

ML20024B737
Person / Time
Site:	Robinson
Issue date:	07/05/1983
From:	Cox H, Starkey R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-011-03L-02, LER-83-11-3L-2, RSEP-83-854, NUDOCS 8307110294
Download: ML20024B737 (3)

Text

NRC FORM 386 U. S. NUCLE AR RE!ULATORY COMMISSION

- (7 77) '

, ucENSEE EVENT REPORT

(( 60NTROL BLOCK:'l : l

.1 l 'I I l lh 6

- (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo lil8-9 7 l s l'c LICENSEE l H l B-l l o l o l o l o l o l -l of ol@l CODE R l1421@15o l o l LICENSE NUM8ER 26 426 l 1LICENSE l 1 l 1TYPE l 1JOl@l57 CAT 68l@

l CON'T o i 7 8 "f"C uJ@l S

60 o61 i s i o DOCKET lolo l 216 l i l@l NUMBER 68 o i 61 69 o i s l 8131@l EVENT DATE 74 75 o I REPORT 7101518131@

DATE P3 -

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l on June 5,1983, at 2016 hours0.0233 days <br />0.56 hours <br />0.00333 weeks <br />7.67088e-4 months <br />, with the unit at 78% power, the circuit breaker for l o 3 l the Boron Injection Tank (BIT) heater channel "B" was found tripped. Investigation l g g] l revealed that the ' heater had failed and shorted to ground. The heater channel was l O s i declared inoperable at 2025 hours0.0234 days <br />0.563 hours <br />0.00335 weeks <br />7.705125e-4 months <br />. This event resulted in operation in a degraded l o s l mode permitted by a limiting condition for operation as defined by Technical Specifi- l l o l y l l cation 3.3.1.2.h which is reportable pursuant to 6.9.2.b.2. The redundant heater l l O la i i channel was operable. There was no threat to the public health and safety. l 7 89 80 C E CODE S BC DE COMPONENT CODE SU8C DE SU E 7

O 9 8

l Sl Fl@ Q@ ]@ l Hl El Al Tl El Rl@ ]@ W @

9 10 11 12 13 18 9 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER/RO EVENT YEAR REPORT NO. CON TYPE NO.

@ yUg RE

_ l21 81 22 3l

[--j 23 l 0] Il Il 24 26 d

27 I ol 31 28 29

-W30

[--j 31 d

32 K A .O NT MET HOURS S8 IT FOR 8. UPPL MANUF CTURER La_]@L_zl@ 34 L_zl@ LzJ@ l ol ol ol ol 37 l_xl@

43 l_nl@ l43 Al@ lCl313121@

33 35 36 40 42 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The failed heater was replaced, and BIT heater channel "B" was declared operable at l t i l 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> on June 6,1983. This event is considered to be the result of component I gw l failure due to normal end of life. No further corrective action is believed l i 3 l necessary. l I t 141 l l 7 8 9 80 ST S  % POWER OTHER STATUS dis O RY DISCOVERY DESCRIPTION 1 5 Ls]@ l d 71 d@l N/A I AL_J@l operator observation l A TIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 [Zj @ @l N/A I l N/A l

.7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES

, NUMBER TYPE DESCRIPTION 1 7 lol010l@[Zjhl N/A l 7 *

• PERSONNE L INJU IES NUMBER DESCRIP TION t a 10l0l0l@l N/A l 7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY Q TYPE DESCRIPTION  %./

9 y @l N/A l

Pu8tiETY- 8307110294 830705 NRC USE ONLY PDR ADOCK 05000261 S

7 2 O 8 9 ISSUED

[_Nj l to

@ DESCRIPTION PDR @ l 68 69 lllllllllllll; 80 5 NAME OF PREPARER Howa rd T. Cox PHONE: (803) 383-4524 {

L

Lf 4T/.

Carolina Power) Ight Company IB33WA0ANSUN"S' TEAM' ELECTRIC PLANT Post Of fice Box 790 Hartsville, South Carolina 29550 JUL 5 1983 Robinson File No: 13510C Serial: RSEP/83-854 Mr. ' James P. O'Reilly Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO. 2 DOCKET NO. 50-261 LICENSE NO. DPR-23 LICENSEE EVENT REPORT 83-011

Dear Mr. O'Reilly:

In accordance with Section 6.9.2 of the Technical Specifications for the H. B. Robinson Steam Electric Plant, Unit 2, the enclosed Licensee Event Report is submitted. This report fulfills the requirements for a written report within thirty (30) days of a reportable occurrence and is in accordance with the format set forth in NURE-0161, July,1977.

l Very truly yours, j . B. tarkey, Jr.

General Manager H. B. Robinson SE Plant HIC:JMC:CWC/th Enclosure cc: R. C. DeYoung (30)

R. - A. Hartfield (3)

. .s " CON ggcSL g a>

lll

o. ,

SUPPLEMENTAL INFORMATION FOR LER 83-011 I. CAUSE DESCRIPTION AND ANALYSIS On June 5,1303, at 2016 hours0.0233 days <br />0.56 hours <br />0.00333 weeks <br />7.67088e-4 months <br />, with the unit at 78% power, the circuit breaker for the Boron Injection Tank (BIT) heater channel "B" was found in the tripped position. The breaker was immediately reset, and upon reclosure, the "480 Volt Ground" alarm was received on the control board.

Investigation revealed the ground to be on BIT heater channel "B". The heater channel was declared inoperable at 2025 hours0.0234 days <br />0.563 hours <br />0.00335 weeks <br />7.705125e-4 months <br /> on June 5,1983.

This event resulted in operation in a degraded mode permitted by a limiting

. condition for operation as defined by Technical Specification 3.3.1.2.h which

, is reportable pursuant to 6.9.2.b.2. The redundant heater channel was operable and capable of maintaining the proper BIT temperature. There was no threat to the public health and safety.

II. CORRECTIVE ACTION Examination of BIT heater "B" revealed that the heater had burned out and shorted to ground. The heater was replaced and declared operable at 0530 hours0.00613 days <br />0.147 hours <br />8.763227e-4 weeks <br />2.01665e-4 months <br /> on June 6,1983.

III. CORRECTIVE ACTION TO PREVENT RECURRENCE This event is considered to be the result of component failure due to normal end of life. No further corrective action is believed necessary.

GM . . . _ , _ _ - -