05000390/LER-2006-001, Re Entrained Air in Essential Raw Cooling Water (ERCW) Piping

Re Entrained Air in Essential Raw Cooling Water (ERCW) Piping

ML060760381
Person / Time
Site:	Watts Bar
Issue date:	03/14/2006
From:	Skaggs M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 06-001-00
Download: ML060760381 (11)

LER-2006-001, Re Entrained Air in Essential Raw Cooling Water (ERCW) Piping

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 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)(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)(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
3902006001R00 - NRC Website

text

Tennessee Valley Authority, Post Office 2000, Spring City, Tennessee 37381-2000 Mike Skaggs Site Vice President, Watts Bar Nuclear Plant MAR 1 4 2006 10 CFR 50.73 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Gentlemen:

In the Matter of Tennessee Valley Authority

)

Docket No. 50-390 WATTS BAR NUCLEAR PLANT (WBN) - UNIT I - FACILITY OPERATING LICENSE NPF LICENSEE EVENT REPORT (LER) 50-390/2006-001 This submittal provides LER 390/2006-001. This LER documents an event where air voids were found in the backup safety-related Essential Raw Cooling Water (ERCW) supply to the Auxiliary Feedwater (AFVW) system. As a result of this, the event is being reported as an operation or condition prohibited by the Technical Specifications in accordance with 10 CFR 50.73(a)(2)(i)(B). This event is also being reported under 10 CFR 50.73(a)(2)(v)(A) and (D) as an event or condition that could have prevented the fulfillment of the safety function.

There are no regulatory commitments associated with this letter. Should there be questions regarding this submittal, please contact Paul L. Pace at (423) 365-1824.

Enclosure:

LER 390/2006-001 cc: Seepage 2 Phlted on Id pa

U.S. Nuclear Regulatory Commission Page 2

,MAR 14 2006 cc (Enclosure):

NRC Resident Inspector Watts Bar Nuclear Plant 1260 Nuclear Plant Road Spring City, Tennessee 37381 Douglas V. Pickett, Senior Project Manager U.S. Nuclear Regulatory Commission MS 08G9a One White Flint North 11555 Rockville Pike Rockville, Maryland 20852-2738 U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, Georgia 30303 Institute of Nuclear Power Operations 700 Galleria Parkway, NW Atlanta, Georgia 30339-5957

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVEDBYOMB: NO. 3150-0104 EXPIRES: 06130/2007 (6-2004)

, the NRC (See reverse for required number of may not conduct or sponsor, and a person is not required to respond to, the diqits/characters for each block) information collection.

3. PAGE Watts Bar Nuclear Plant 05000 390 1 OF 9

4. TITLE Entrained Air in Essential Raw Cooling Water (ERCW) Piping

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED TFACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEUNTIA RBEV MONTH DAY YEAR0500l NUMBER NO.

MNH DY05000 FACILITY NAME DOCKET NUMBER 01 13 2006 2006 001 00 03 14 2006 05000

9. OPERATING MODE

11. TIIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check allthat apply)

Mode 1 a

20.2201(b)

D 20.2203(a)(3)(i) a 50.73(a)(2)(i)(C)

Q 50.73(a)(2)(vii)

O 20.2201(d) 5 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(A) 5 50.73(a)(2)(viii)(A) o 20.2203(a)(1) 5 20.2203(a)(4)

D 50.73(a)(2)(ii)(B)

E 5073(a)(2)(viii)(B) o 20.2203(a)(2)(i)

C 50.36(c)(1)(i)(A) 5 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A)

10. POWER LEVEL a

20.2203(a)(2)(ii)

D 50.36(c)(1)(ii)(A) 5 50.73(a)(2)(iv)(A)

D 50.73(a)(2)(x) 1 5 20.2203(a)(2)(iii) 5 50.36(c)(2) 0 50.73(a)(2)(v)(A) a 73.71(a)(4) 00 20.2203(a)(2)(iv) 5 50.46(a)(3)(ii) 5 50.73(a)(2)(v)(B) a 73.71(a)(5) o 20.2203(a)(2)(v)

[

50.73(a)(2)(i)(A) a 50.73(a)(2)(v)(C)

D OTHER O 20.2203(a)(2)(vi)

[3 50.73(a)i2)(i)(B)

[

50.73(a)(2)(v)(D)

Specify in Abstract below or in (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 (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A)

VI. B.

Previous LERs on Similar Events For WBN, there have been no previous events related to air intrusion into a raw water system.

C.

Additional Information

None.

D.

Safety System Functional Failure This event involved a safety system functional failure as defined in Nuclear Energy Institute (NEI) 99-02, Revision 3.

E.

Loss of Normal Heat Removal Consideration This event is not considered a scram with loss of normal heat removal.

VII.

COMMITMENTS

None