ML19318A910

LER 80-075/01T-0:on 800524,auxiliary Essential Raw Cooling Pump B-B Failed During Surveillance Testing.Caused by Personnel Error in Calculating Pump Differential Pressure. Instrumentation Recalibr & Pump Retested

ML19318A910
Person / Time
Site:	Sequoyah
Issue date:	06/17/1980
From:	Sullivan J TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19318A906	List: ML19318A905 ML19318A910
References
LER-80-075-01T, LER-80-75-1T, NUDOCS 8006240369
Download: ML19318A910 (2)

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[Ti r] [ Event was caused by an personnel error in calculating pump differential

[g- [ pressure. Personnel . shall be re-instructed in performance. The I T-~) l instruecntation involved was recalibrated and the_ pump retc.ated satig.f_pc ,

[, ! .j j torily. The problect was with the instrumentation and not with the pump.

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LER SUPPLEMENTAL INTOPJiATION SQRO-50-327/ 8075 Technical Specificaton Involved 3.7.4.2 and 4.0.5 Peported Under Technical Specification 6.9.1.12.b Date of occurrence: 5/24/80 Time of ]ccurrenec: 2356 CST Identificatien and Description of Occurrence A surveillance instruction (SI74) en Auxiliary Essential Raw Cooling (AERCW) pump E-B was performed on 5/24/E0 prior to entry into !fode 4.

The unit operator made a computation error in calculating the differen-tial Treasure and erroncously passed the purp. Therefore, unit i entered Mede 4 at 2356 CST on 5/24/60 with SR 4.0.5 and LCO 3.7.4.2 unsatisfied. AERCW pump D-B nctually ' ailed due to low differential prescure. The purp was discovered to not meet the acceptance criteria during the review process or. 6/5/80 at 1100 CST.

Conditions Prior to occurrence Unit 1 in Mode 5.

Actions cpecified in the Technical Specifications Surveillnnce Requiremento not met due to inoperab1_e ecuipment. . , _ ,

Unit 1 be in cold shutdevn (Mode 5) within 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

Apparent Cause of Occurrence Computational error.

Analysis of Occurrence There was no hazard to the public health and safety. ,

Corrective Action Reinstruct operating personnel. It is suspected that a problem exists with installed inotrumentation cnd not with the pump. The instrumentation was recalibrated and SI rerun and pump B-B passed en 6/9/80.

Failure Data None