ML20027A265

LER 78-103/03L-0:on 781009,during Surveillance Testing,Point R216 on Heat Trace Found One Degree Below 105 F Per Tech Spec 4.1.2.2.Caused by Blown Fuse in Temp Controller in Circuit 109.Fuse Replaced & Circuit Rechecked

ML20027A265
Person / Time
Site:	Davis Besse
Issue date:	10/11/1978
From:	Caba E TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027A264	List: ML20027A263 ML20027A265
References
LER-78-103-03L, LER-78-103-3L, NUDOCS 7811070188
Download: ML20027A265 (3)

Text

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U.S. NUCLEAR REGULATORY COMMIS510N NRC FOEfM 366 87 77)

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LICENSEE EVENT REPORT -

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[6Til I During the performance of surveillance testing on 10/9/78 at 1510 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.74555e-4 months <br />, point R216 trace was found to be one degree below the 1050F temperature as required [

g l on the heat The Boric Acid Flowpath was declared inop- j ITT n I per Technical Specification (TS) 4.1.2.2.

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I o I s l l erable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on 10/9/78. Since the point at which boric acid crystallizes

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the highest concentration possible coming from the Boric Acid Addition Tank is l o is 1 I at traced line. l lO l 71 l 950F, there was no danger of any crystallization in the heat .

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,6 si 40 ai 42 a 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l During the checkout of recorder point R2-16 in circuit 109, a blown fuse was found in j i i I the temperature controller. The fuse was replaced, and the circuit was checked again The boric acid injection heat trace was declared opera-;

{ g i and found operating properly.

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, 3 l ble following a retest of the line on 10/12/78 at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br />, and the unit was re-

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TOLEDOEDISONCOMPAdY DAVIS-BESSE UNIT ONE NUCLEAR' POWER STATION

. SUPPLEMENTAL INFORMATION FOR LER NP-33-78-122 DATE OF EVENT: October 9, 1978 FACILITY: Davis-Besse Unit 1 ,

IDENTIFICATION OF OCCURRENCE: Boric Acid Flowpath Heat Trace was declared inopera-ble. l b

Conditions Prior to Occurrence: The unit was in Mode 3, with Power (MWT) = 0, and Load (MWE) = 0.

t Description of Occurrence: During the performance of ST 5011.01, Section 6.1,.

" Boron Injection Flowpath Heat Trace Test", on October 9, 1978,. at 1510 hours0.0175 days <br />0.419 hours <br />0.0025 weeks <br />5.74555e-4 months <br />, point R2-16 on the circuit log of the heat trace was found to be one degree below the 105 F temperature as required per Technical Specification Surveillance Require- I ment 4.1.2.2. The Boric Acid Flowpath was declared inoperable at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on October 9,1978, which placed the unit in the Action Statement of Technical Speci-

. fi.catio.n 3.1.2.2. . _ _ . .

Designation of Apparent Cause of Occurrence: During an instrument and control checkout of the heat trace on October 10, 1978, the tenperature of point R2-16 was back up to its normal value of 1150F. The surveillance test was rerun on October 12,1978 at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br /> and the temperature of point R2-16 read 115 F, af ter which the boron injection flowpath was declared operable. Then following an electrical maintenance checkout of circuit 109, a blown fuse in the tempera-ture controller was found. It appears that the temperature was originally in-( creased to 1150F from the periodic injection of boric acid from the Boric Acid Addition Tank (which is at approximately 1300 F) through the heat traced line.

The heat trace was, therefore, thought to be operating properly until the blown fuse was discovered.

Analysis of Occurrence: There was no danger to the health and safety of the public l l

or to unit personnel. Since the temperature was only one degree below the accepta-ble value, and the point at which boric acid crystallizes at the highest concentra-tion possible coming from the Boric Acid Addition Tank is 950F, there was no

- danger of any crystallization in the heat traced line.

Corrective Action: The instruments and controls of the heat trace point R2-16 were checked and found to be working properly on October 10, 1978, under Instrument and Control Work Request I&C-3052. The electrical companents were checked on Octo-ber 14, 1978, under Maintenance Work Request 78-1441 and a blown fuse was discovered in the temperature controller. It was replaced, and the circuit was checked out l

and found to be operating properly.  !

LER #78-103 ,

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TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION

• PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-78-122 The surveillance test of the boric acid heat trace was repeated on October 12, 1978, at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br />. The boric acid flowpath was declared operable, and the unit was removed from the Action Statement of Technical Specification 3.1.2.2. .

Failure Data: There have been no previous reported similar occurrences.

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( LER #78-103 .

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