Text

Monthly Operating Repts for Mar 1998 for Limerick Generating Station,Units 1 & 2
	ML20216F360
Person / Time
Site:	Limerick
Issue date:	03/31/1998
From:	Angus V; PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	;
Shared Package
ML20216F325	List: ML20216F320; ML20216F347; ML20216F360;
References
	NUDOCS 9804170042
	Download: ML20216F360 (8)
	v • d • e

.

Docket No. 50-352 Attachm:nt to Monthly Operating Report for March 1998 Limerick Generating Station Unit 1 March 1 through March 31,1998

l. Narrative Summary of Operatino Exoeriences Unit 1 began the month of March 1998 at 93% of rated thermal power (RTP) due to limitations resulting from the clogged #2 jet pump riser nozzle. Folloviing evaluation, ;

power was restored to 100% on March 6,1998 at 0150 hours0.00174 days 0.0417 hours 2.480159e-4 weeks 5.7075e-5 months with one remaining limitation for the jet pump problem which limits core flow to 105%.

For the remainder of the month, power was limited to less than 100% RTP in varying degrees by the jet pump problem, a control rod being fully inserted, and coastdown.

On March 6,1998 at 0156 hours0.00181 days 0.0433 hours 2.579365e-4 weeks 5.9358e-5 months , reactor power was reduced to 99% of RTP due to cyclic output from the Loose Parts Monitoring system. Power was restored to 100% RTP at 1600 hours0.0185 days 0.444 hours 0.00265 weeks 6.088e-4 months .

On March 7,1998 at 2200 hours0.0255 days 0.611 hours 0.00364 weeks 8.371e-4 months , power was reduced to 98% of RTP for main turbine valve testing. Power was restored to 99% RTP at 2300 hours0.0266 days 0.639 hours 0.0038 weeks 8.7515e-4 months .

On March 14,1998 at 2230 hours0.0258 days 0.619 hours 0.00369 weeks 8.48515e-4 months , power was reduced to 90% for main turbine control valve testing. Power was restored to 96% on March 15,1998 at 0108 hours0.00125 days 0.03 hours 1.785714e-4 weeks 4.1094e-5 months .

On March 21,1998 at 2000 hours0.0231 days 0.556 hours 0.00331 weeks 7.61e-4 months , power was reduced to 93% for main turbine valve testing. Power was restored to 94% at 2200 hours0.0255 days 0.611 hours 0.00364 weeks 8.371e-4 months .

On March 22,1998 at 0047 hours5.439815e-4 days 0.0131 hours 7.771164e-5 weeks 1.78835e-5 months , power was reduced to 85% of RTP due to Recirculation pump high temperatures and increasing drywell parameters due to tripping of the 124B load center breaker. Power was further reduced to 50% of RTP at 1400 hours0.0162 days 0.389 hours 0.00231 weeks 5.327e-4 months as a conservative effort to minimize overall effect on the plant. Power was restored to 87% of RTP on March 26,1998 at 2200 hours0.0255 days 0.611 hours 0.00364 weeks 8.371e-4 months .

On March 26,1998 at 2200 hours0.0255 days 0.611 hours 0.00364 weeks 8.371e-4 months , power was reduced to 60% of RTP for a rod pattern adjustment. Power was restored to 92% of RTP on March 27,1998 at 1110 hours0.0128 days 0.308 hours 0.00184 weeks 4.22355e-4 months .

On March 27,1998 at M00 hours, power was reduced to 88% of RTP due to high turbine backpremeure. Power was restored to 90% of RTP at 2300 hours0.0266 days 0.639 hours 0.0038 weeks 8.7515e-4 months .

On March 30,1998 at 1645 hours0.019 days 0.457 hours 0.00272 weeks 6.259225e-4 months , power was reduced to 86% of RTP due to high turbine backpressure. Power was restored to 90% of RTP on March 31,1998 at 0225 hours0.0026 days 0.0625 hours 3.720238e-4 weeks 8.56125e-5 months .

On March 31,1998 at 0950 hours0.011 days 0.264 hours 0.00157 weeks 3.61475e-4 months , power was reduced to 88% of RTP due to high turbine backpressure. Power was restored to 90% of RTP at 2120 hours0.0245 days 0.589 hours 0.00351 weeks 8.0666e-4 months .

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9804170042 980412 PDR ADOCK 05000352 R PDR

Unit 1 ended this month operating at 90% RTP due to the #2 jet pump problem, the single control rod being fully inserted, and the end of cycle coastdown.

11. Challenaes to Main Steam Safety Relief Valves l

There were no challenges to the Main Steam Safety Relief Valves during the month of I March and year to date.

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' Dock:t No. 50-353 Attichm nt to Monthly I Operating Report for March 1998 Limerick Generating Station Unit 2 March 1 through March 31,1998

l. Narrative Summary of Operatina Experiences l

l Unit 2 began the month of March 1998 at 96% rated thermal power (RTP). Power was at 96% of RTP for main turbine valve testing. Power was restored to 100% RTP on March 1 at 0600 hours0.00694 days 0.167 hours 9.920635e-4 weeks 2.283e-4 months .

On March 6,1998 at 2215 hours0.0256 days 0.615 hours 0.00366 weeks 8.428075e-4 months , power was reduced to 98% of RTP for main turbine valve testing.

On March 7,1998 at 0021 hours2.430556e-4 days 0.00583 hours 3.472222e-5 weeks 7.9905e-6 months , power was further reduced to 86% of RTP for main (

turbine control valve testing.

On March 7,1998 at 1100 hours0.0127 days 0.306 hours 0.00182 weeks 4.1855e-4 months , power was further reduced to 57% of RTP for rod pattern adjustment and scram timing 19 control rods. Power was restored to 100% RTP on March 8,1998 at 2235 hours0.0259 days 0.621 hours 0.0037 weeks 8.504175e-4 months , following troubleshooting of the BOP battery ground in the 2C reactor feedpump trip circuit.

On March 10,1998 at 0359 hours0.00416 days 0.0997 hours 5.935847e-4 weeks 1.365995e-4 months , power was reduced to 76% of RTP for rod pattern adjustment. Power was restored to 100% RTP at 0900 hours0.0104 days 0.25 hours 0.00149 weeks 3.4245e-4 months .

On March 14,1998 at 2038 hours0.0236 days 0.566 hours 0.00337 weeks 7.75459e-4 months , power was reduced to 9B% of RTP for main turbine valve testing. Power was restored to 100% RTP at 2121 hours0.0245 days 0.589 hours 0.00351 weeks 8.070405e-4 months .

On March 21,1998 at 2103 hours0.0243 days 0.584 hours 0.00348 weeks 8.001915e-4 months , power was reduced to 98% of RTP for main turbine valve testing. Power was restored to 100% RTP at 2220 hours0.0257 days 0.617 hours 0.00367 weeks 8.4471e-4 months .

On March 29,1998 at 0150 hours0.00174 days 0.0417 hours 2.480159e-4 weeks 5.7075e-5 months , power was reduced to 97% of RTP for main turbine valve testing. Power was restored to 100% RTP at 0234 hours0.00271 days 0.065 hours 3.869048e-4 weeks 8.9037e-5 months . .

Unit 2 ended this operating period at 100% of RTP.

ll. Challenaes to Main Steam Safety Relief Valveji l

There were no challenges to the Main Steam Safety Relief Valves during the month of March and year to date.

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ML20216F360

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