05000445/LER-2010-002, Regarding Loss of Automatic Initiation of Auxiliary Feedwater Upon Loss of Main Feedwater

Regarding Loss of Automatic Initiation of Auxiliary Feedwater Upon Loss of Main Feedwater

ML100880111
Person / Time
Site:	Comanche Peak
Issue date:	03/18/2010
From:	Madden F Luminant Generation Co, Luminant Power
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CP-201000424, TXX-10023 LER 10-002-00
Download: ML100880111 (7)

LER-2010-002, Regarding Loss of Automatic Initiation of Auxiliary Feedwater Upon Loss of Main Feedwater

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function
4452010002R00 - NRC Website

text

Rafael Flores Senior Vice President

& Chief Nuclear Officer rafaes.flores@Luminant.com Luminant Power P O Box 1002 6322 North FM 56 Glen Rose, TX 76043 Lum inant T254 897 5550 C 8 17 559 0403 F 254 897 6652 CP-201000424 TXX -10023 Ref. #

10CFR50.73(a)(2)(i)(B) 10CFR50.73(a)(2)(vii)

March 18, 2010 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK NUCLEAR POWER PLANT DOCKET NOS. 50-445 and 50-446 LOSS OF AUTOMATIC INITIATION OF AUXILIARY FEEDWATER UPON LOSS OF MAIN FEEDWATER LICENSEE EVENT REPORT 445/10-002-00

Dear Sir or Madam:

Enclosed is Licensee Event Report (LER) 445/10-002-00, "Loss of Automatic Initiation of Auxiliary Feedwater Upon Loss of Main Feedwater," for Comanche Peak Nuclear Power Plant (CPNPP) Units 1 and 2.

This communication contains no licensing basis commitments regarding CPNPP Units 1 and 2.

Should you have any questions, please contact Gary Merka at (254) 897-6613.

Sincerely, Luminant Generation Company LLC Rafael Flores By:

Fred W. Madden Director, Oversight & Regulatory Affairs A member of the STARS (Strategic Teaming and Resource Sharing) Alliance K

Callaway

. Comanche Peak - Diablo Canyon

• Palo Verde

• San Onofre. South Texas Project

• Wolf Creek

U. S. Nuclear Regulatory Commission TXX-10023 Page 2 March 18, 2010 Enclosure c -

E. E. Collins, Region IV B. K. Singal, NRR Resident Inspectors, Comanche Peak

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION g,3%pl0D BY OMB NO. 3150-0104 EXPIRES:

(9-2007)

, the NRC digits/characters for each block) may not conduct or sponsor, and a person is not required to respond to, the information collection.

3. PAGE Comanche Peak Nuclear Power Plant Unit 1 05000 445 1OF5

4. TITLE Loss of Automatic Initiation of Auxiliary Feedwater Upon Loss of Main Feedwater

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR FACILITY NAME DOCUMENT NUMBER NUMBER NO.

CPNPP Unit 2 05000 446 01 20 2010 2010 002 00 03 18 2010 05000 05000

9. OPERATING MODE

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)

Li 20.2201(b)

[]

20.2203(a)(3)(i)

El 50.73(a)(2)(i)(C)

L] 50.73(a)(2)(vii) 3 LI 20.2201(d)

E] 20.2203(a)(3)(ii)

[]

50.73(a)(2)(ii)(A)

LI 50.73(a)(2)(viii)(A)

El 20.2203(a)(1)

LI 20.2203(a)(4)

Li 50.73(a)(2)(ii)(B)

H 50.73(a)(2)(viii)(B)

[1] 20.2203(a)(2)(i)

E]

50.36(c)(1)(i)(A)

[

50.73(a)(2)(iii) 50.73(a)(2)(ix)(A)

10. POWER LEVEL

[]

20.2203(a)(2)(ii)

Li 50.36(c)(1)(ii)(A)

Li 50.73(a)(2)(iv)(A)

Li 50.73(a)(2)(x)

LI 20.2203(a)(2)(iii)

Fi 50.36(c)(2)

Li 50.73(a)(2)(v)(A)

LI 73.71 (a)(4) 0 LI 20.2203(a)(2)(iv)

[]

50.46(a)(3)(ii)

[

50.73(a)(2)(v)(B)

E] 73.71(a)(5)

[] 20.2203(a)(2)(v)

E]

50.73(a)(2)(i)(A)

[E 50.73(a)(2)(v)(C)

[F OTHER Fi 20.2203(a)(2)(vi)

[]

50.73(a)(2)(i)(B)

[3 50.73(a)(2)(v)(D)

VOLUNTARY LER

12. LICENSEE CONTACT FOR THIS LER FACILITY NAME TELEPHONE NUMBER (Include Area Code)

Timothy A. Hope, Nuclear Licensing Manager (254)897-6370CAUSE SYSTEM COMPONENT MANU-REPORTABLE

CAUSE

SYSTEM COMPONENT MANU-REPORTABLE FACTURER TOEPIX FACTURER TO EPIX

14. SUPPLEMENTAL REPORT EXPECTED

15. EXPECTED MONTH DAY YEAR EXI YES (If yes, complete 15. EXPECTED SUBMISSION DATE)

LiNO SUBMISSION 05 31 2010 1

DATE I-31 01 ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)

On January 20, 2010, Comanche Peak Nuclear Power Plant (CPNPP) Unit 1 was in Mode 3 during a planned outage and Unit 2 was in Mode 1 operating at 100% power. At 1827 hours0.0211 days <br />0.508 hours <br />0.00302 weeks <br />6.951735e-4 months <br />, during review of an Oconee INPO OE report, parallels were discovered between the Oconee design and the CPNPP design. Further investigation determined that the required completion times for TS 3.3.2, Condition J, may not have been completed in the past when Units 1 and 2 were operating at low power with only one MFWP providing MFW flow.

The cause of this event is still being determined and a supplemental report providing this information will be submitted by May 31, 2010. Corrective actions include the completion of procedure changes on Unit 1 to ensure compliance with TS. Since Unit 2 has been operating at 100% power with both MFW pumps in service since discovery of this condition, corresponding changes to the Unit 2 procedures will be completed prior to removing one MFW pump from service during the next shutdown of Unit 2 or prior to startup of Unit 2 from any event which results in an unplanned trip of Unit 2.

All times in this report are approximate and Central Standard Time unless noted otherwise.

NRC FORM 366 (9-2007)

PRINTED ON RECYCLED PAPER (If more space is required, use additional copies of SUMMARY OF THE EVENT, INCLUDING DATES AND APPROXIMATE TIMES CPNPP TS 3.3.2, Function 6.g, requires two Main Feedwater pump (MFWP) trip channels for each automatic Auxiliary Feedwater Pump (AFW) initiation circuit.

TS 3.3.2 also requires a manual initiation circuit, which was not affected by this event. Per TS 3.3.2, Condition J, if one required MFWP trip channel is inoperable, the inoperable trip channel must be placed in the trip condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> or the plant must be placed in MODE 3 within the following 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

On January 20, 2010, CPNPP Unit 1 was in Mode 3 during a planned outage and Unit 2 was in Mode 1 operating at 100% power. At 1827 hours0.0211 days <br />0.508 hours <br />0.00302 weeks <br />6.951735e-4 months <br />, during review of Oconee INPO OE30225 ("Main Feedwater Pump Reset design feature provides incorrect Main Feedwater Pump status"), a System Engineer (Utility, Non-Licensed) discovered parallels between the Oconee design and the CPNPP design. Further investigation determined that CPNPP operating procedures allowed for one MFWP [EIIS: (SJ)(P)] to be reset (i.e.,

hydraulic oil pressure present) but not aligned to be a source of MFW.

During low-power plant operations, such as start-up or when Unit 1 was recently operated at a lower power level while a single Main Transformer was in service, only one MFWP is creating forward MFW flow. The other MFWP is in a "reset" condition, with the Steam Stop Valves [EIIS: (SJ)(SHV)] open. This condition utilizes hydraulic trip fluid to keep the (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) (17) prior to startup of Unit 2 from any event which results in an unplanned trip of Unit 2. An Operations Shift Order has been issued to advise operating staff of the condition and to note that the Unit 2 procedures will need to be updated/revised prior to a restart of Unit 2 should a trip or shutdown occur and a restart is required. This shift order item will remain in effect until the Unit 2 procedures are updated.

VI.

PREVIOUS SIMILAR EVENTS

There have been no previous similar reportable events at CPNPP in the last three years.PRINTED ON RECYCLED PAPER