ML20027A510

LER 78-112/03L-0:on 781109,ST 5011.01, Boron Injection Flowpath Test Performed 7.5-h Later than Allowed.Caused by Sys Design Requiring Frequent Additions of Water.Facility Change Request Prepared

ML20027A510
Person / Time
Site:	Davis Besse
Issue date:	12/06/1978
From:	Caba E, Marley J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027A507	List: ML20027A506 ML20027A510
References
LER-78-112-03L, LER-78-112-3L, NP-33-78-132, NUDOCS 7812120173
Download: ML20027A510 (3)

Text

3 U.S. NUCLE AR REGULATCRY COMMISSION NRC FORM 366 (7 77)

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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8 60 61 COCK ET NU?.tBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES Oio was f o l2l l On 11/9/78, it was discovered that ST 5011.01, " Boron Inj ection Flowpath Test", ]

The test was completed 7.5  ;

,,,3, g not performed to meet Surveillance Requirement 4.1.2.2a.

, o g ,, , ; hours later than the allowed test f requency with the maximum allowable extension. l If  ;

go,3,  ; There was no danger to the health and safety of the public or to unit personnel.

, o ,o , l necessary, the makeup pump suction could be diverted to the Berated Water Storage

o l 7 g 1 Tank which has a capacity of between 434,650 and 550,000 gallons and a minimum boron l i o Is ! I concentration of 1800 ppm. (NP-33-78-132)

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43 44 47 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i j o i l Due to the design of this system, the addition of water reduced the temoerature in thel

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Ii 15 I l heat traced line below the required 1050F. Due to the feequent additions of water.

, , ,3, j the test was delayed long enough that it exceeded the maximum time interval. A Faci- 1 l

I i I 3 I l lity Change Request was written to either look into the possibility of modifying the

, , ,, , , Technical Specification or to heat the water.

7 8 3 oTHER STATUS blSCO RY DISCOVERY OESCRIPTION STAT S  % POWER l

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'VR 78-168 .. . . . . n . , o . u o c o James Mari m and Erdal Caba psoNg: 410-2 o 5000. Wr . 77A or$236-

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. .o TOLEDO EDISON COMPANY g DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER NP-33-78-132 DATE OF EVENT: November 9, 1978 FACILITY: Davis-Besse Unit No.1 IDENTIFICATION OF OCCURRENCE: The maximum allowed test frequency f or the boron injection heat trace was exceeded.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 1330.5 and Load (MWE) = 452.

I Description of Occurrence: On November 9,1978 at 0930 hours0.0108 days <br />0.258 hours <br />0.00154 weeks <br />3.53865e-4 months <br />, the Surveillance Test Engineer discovered that Surveillance Test ST 5011.01, " Boron Injection Flow-path Test", was not performed to meet Technical Specification 4.1.2.2a. The test was completed 7.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> later than the allowed test frequency with the maximum allowable extension.

Technical Specification 4.1.2.2a requires that a weekly test be run to verify that the heat traced temperatures in the boric acid flowpath are it 1050F. The test was completed at 1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br /> on November 9,1978 and did meet the acceptance criteria.

Designation of Apparent Cause of Occurrence: It was found that the test was started within the allowable time interval but three of the heat traced temperature points did not meet the acceptance criteria of 2.1050F. This was due to the con-( stant addition of primary or demineralized water through part of the heat trace (

line to the Reactor Coolant System for baron concentration control due to the  ;

transients encountered. Due to the design of this system, this addition of water reduced the temperature in the heat traced line below the required 105 F. When the

' surveillance test was first performed on November 8,1978, the three heat traced temperatures had never recovered enough to pass the ; 1050F requirement. Due to the frequent addition of water to the Reactor Coolant System, the test was delayed long enough that it exceeded the maximum tLae interval. j i

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. If necessary, the makeup pump suction could be diverted to l the Borated Water Storage Tank (BWST) which has capacity of 434,650 to 550,000 gal-lons minimum boron concentration of 1800 ppm. 'l <

I LER #78-112 (

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W TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STAT,10N PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-78-132 Corrective Action: Facility Change Request (FCR)78-508 was written to either look into the possibility of modifying the Technical Specifications to reflect the fact that the much cooler makeup water flowpath utilizes the same section of l heat traced piping, or to design a heat exchanger into the system to heat the water before it reaches the heat traced portion of the pipe, or to add additional heat trace to keep the temperatures 2.lG50F even if cold water is injected.

Failure Data: There have been no previous occurrences of exceeding surveillance requirement test frequency due to a boron injection flowpath design deficiency. .;

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LER #78-112 .

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