ML19256A696

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LER 78-120/03L-0 on 781207:containment post-accident Radiation Monitors Re 5029 & 5030 Failed Due to Design Error.Ambient Temp Exceeded Limits & Caused Decomposition of Pump Motor Bearing Grease,Resulting in Bearing Seizure
ML19256A696
Person / Time
Site: Davis Besse Cleveland Electric icon.png
Issue date: 01/04/1979
From: Adams J, Kovach S
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19256A691 List:
References
LER-78-120-03L, LER-78-120-3L, NUDOCS 7901090213
Download: ML19256A696 (4)
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N$tC F oRM 366 (7 77) LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Radiation Monitor h RE 5030 was declared j l o l 2 ) l t 0200 on 12/7/78, Containment Post-Accident A

l o 3 g noperable. The unit was placed in the Action Statement of T.S. 3.3.3.6. At 0 i

RE 5029 was declared inoperable and the unit was placed in the Action Statement of T.S j o 4 was in Hot Standby. At 2045 RE 5030 was declared j goj3j 3.4.6.1 and 3.3.3.1. At 0500 the unit g

l o is J loperable and the unit was removed from Action Statements of T.S. 3.4.6.

j On 12/11/78, RE 5029 was restarted at 0935 and again failed at 1135. At 1225 RE 5029 Jo),j

6. j lwas operable and the unit was removed f rom Action Statement of T.S. 3.3.3. w yoy3j (NP-33-78-143)

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l g 43 44 47 J3 cAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Ambient temperatures ex- l l, ;o ; j On 12/7/78, RE 5029 and RE 5030 failed due to design error.

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ceeding design limits caused decomposition of the pump motor bearing grease, failure of the pump.

,in bearing seizure. On 12/11/78, RE 5029 failed due to component to reduce the motor y g , , ,; ; A meeting with the vendor resulted in a Facility Change Request speed. Further corrective action will be recommended af ter analysis of f ailures is mgle. 89 gg i a 9 DISCOVERY DESCRIPTION OTHE R ST ATUS SCO HY ST A $ %POMR l l W@l Operator Observation 11 15llE @ l 0 l 9 l 0 l@l NA A TlVITY CONTENT LOCATION OF RELE ASE AVOUNT OF ACitVITY l RE LE ASEO OF HE LE ASE l l NA Ii lo I [zj @ Lzj@l NA 10 44 45 84 7 8 9 11 PE HSONNE L ixPOSUH ES NUUH[ n TYPE DESCHIPTION ' l l i l 71 101010 l@lz l@lNA

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-78-143 DATE OF EVENT: December 7,1978 acd December 11, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Containment Post Accident Radiation Monitors RE 5029 and RE 5030 were inoperabic.

On December 7, 1978 at 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> and at 0315 hours0.00365 days <br />0.0875 hours <br />5.208333e-4 weeks <br />1.198575e-4 months <br />, Conditions Prior to Occurrence: On December 11, the unit was in Mode 1, with Power (MUT) = 2495, and Load (MWE) = 823.

1978 at 1135 hours0.0131 days <br />0.315 hours <br />0.00188 weeks <br />4.318675e-4 months <br />, the unit was in Mode 1, with Power (MWT) = approximately 2550 and Load (MNE) = approximately 833.

i Description of Occurrence: At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on December 7, 1978,The Containment Post-unit was placed in Accident Radiation Monitor RE 5030 was declared inoperable. Technical Specification the Action Statement of Technical Specification 3.3.3.6.

3.3.3.6 requires post-accident monitoring instrumentation channels to be operable to be  ;

in Modes 1, 2, or 3. The Action Statement requires the inoperabic instrument restored within 30 days or the unit must be placed in Hot Shutdown (Mode 3) within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on December 7, the pump on RE 5029, the other Containment Post-Accident RE 5029 was de-At 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br />, the pump stopped.

Radiation Monitor, was started. The unit was placed in the Action Statement of clared inoperabic at 0315 hours0.00365 days <br />0.0875 hours <br />5.208333e-4 weeks <br />1.198575e-4 months <br />.

Technical Specification 3.4.6.1 and also Action Statement 14 of Technical Specifica-tion 3.3.3.1. Technical Specification 3.4.6.1 requires the operability of containment atmospheric particulate and gaseous radioactivity as well as containment Technical Specificationsump and 3.3.3.1 flow monitoring systems in Modes 1, 2, 3 and 4.

requires the operability of containment gaseous and particulate leakage detection channels in Modes 1, 2, 3, and 4.

atmosphere particulate With the inoperability of both RE 5029 and RE 5030, containment and gaseous radioactivity monitoring systems and leakage thedetection unit mustsystems be in Hotwere in-Stand-operable. The applicable Action Statement states thatsix hours ;nd in Cold Shutdown (M by (Mode 3) within the nextThe unit commenced shutdown at 0330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> and At ing 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

was2045 in Mode 3 at 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br />, hours on December 7, 1978, in compliance with the Action Statement, .,

RE 5030 was declared operational, and the unit was removed from the Action Statements of Technical Specifications 3.4.6.1 and 3.3.3.1.

10,1978, at 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br />, RE 5029 was declared operable, removing the unit On December of Technical Specification 3.3.3.6. On December 11, 1978 from the Action Statement 1135 hours0.0131 days <br />0.315 hours <br />0.00188 weeks <br />4.318675e-4 months <br />, the pump failed, at 0935 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.557675e-4 months <br />, the pump on RE 5029 was started, but at in the Action Statement of Technical Specification 3.3.3.6.

again placing the unit LER #78-120

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i TOLEDO EDISON COMPANY DAVIS-EESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLDtENTAL INFORMATION FOR LER NP-33-78-143 I

I Designation of Apparent Cause of Occurrence: The cause of the failure of RE 5029 failure due to design error.

and RE 5030 on December 7 is attributed to component Ambient temperatures exceeding design limits caused changes in bearing grease com-position which led to bearing seizure in the pump motor.

The cause of the f ailure of RE 5029 on December 11 was due to component failure of the pump due to pump bearing seizure.  :

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. Grab samples were obtained and analyzed during the period that RE 5029 and RE 5030 were both inoperable. No incident requiring the use of these instruments occurred during this time.

On December 7,1978, the motor ict RE 5030 was replaced under Maintenance Work Order 78-2856. During the replacement of the motor on RE 5030, it was discovered that a 2 HP motor that was not in accordance with specifications was installed.

It was replaced with a lh HP motor of the proper specifications. The pump was rebuilt and re-installed. The installation of a 2 HP motor is being investigated at this time.

Corrective Action: After performance of Surveillance Test ST 5032.01, " Monthly Functional Test of the Radiation Monitoring System", RE 5030 was declared operable at 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br />. The unit was removed from the Action Statements of Technical Speci-fications 3.4.6.1 and 3.3.3.1.

On December 7-10, 1978, under Maintenance Work Order 78-2855, the motor on RE 5029 was replaced and a rebuilt pump installed. On Deceaber 10,1978 at 1145 hours0.0133 days <br />0.318 hours <br />0.00189 weeks <br />4.356725e-4 months <br />, af ter performance of ST 5032.01, RE 5029 was declared operable,Onremoving the unit December 11, at from the Action Statement of Technical Specification 3.3.3.6.

0935 hours0.0108 days <br />0.26 hours <br />0.00155 weeks <br />3.557675e-4 months <br />, the pump on RE 5029 was started and shortly thereaf ter the pump f ailed again, placing the unit in the Action Statement of Technical Specification 3.3.3.6.

At 1225 hours0.0142 days <br />0.34 hours <br />0.00203 weeks <br />4.661125e-4 months <br />, af ter replacement with a rebuilt pump, the pump was restarted and the unit was removed from the Action Statement of Technical Specification 3.3.3.6.

On December 8,1978, a meeting was held between Victorcen Company (radiation monitor vendor) and Toledo Edison representatives regarding all past radiation detector problems and failures. As a result of this meeting, Facility Change Request (FCR)78-521 has been generated. This requests that the speed of the pumps on RE 5029 ,

and RE 5030 be reduced, thereby reducing sample volume flow rate. Reduced pump speed would reduce required horsepower and current drawn by the monitors and decrease pump wear and internal heating.

LER #78-120

s TOLEDO EDISON CO: IPA';Y DAVIS-BESSE NUCLEAR PO'iER STATION UNIT ONE PAGE 3 SUPPLI2tE!TTAL INFOR'!ATION FOR LER NP-33-78-143 Other FCRs have been issued: FCR 78-159 has been issued to the station for tmple-mentation. This change request will result in the inboard and outboard pump motor bearings being replaced with sealed bearings. FCR 78-299 requested the installa-tion of a cooling system for RE 5029 and RE 5030. FCR 78-384 requested an engineer-ing evaluation of motor-related problems on radiation monitors. Further corrective action will be recommended by the Power Engineering Department when the analysis of the mode of f ailures is completed.

Failure Dat_a: This is a repetitive occurrence. Previously reported occurrences of component f ailure due to high ambient temperature, pump motor , or bearing seizure problems were reported in Licensee Event Reports NP-33-78-30, NP-33-78-45, NP-33-7 8-54, NP-33-78-77, NP-33-78-105, NP-33-78-111, NP-33-78-115, and NP-33-78-127.

LER #78-120

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