ML121170378
| ML121170378 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek, San Onofre  |
| Issue date: | 01/04/2011 |
| From: | NRC/OI |
| To: | |
| References | |
| FOIA/PA-2011-0157 | |
| Download: ML121170378 (6) | |
Text
Concern: 1 SM-
- RX Code or Functional Area: Engineerin I ...... L
- icpieElcrc l1*01 Priority: ___________________________________
- SecrityCateory:*01 Priority 12 Basis.:________________
Concern: (A concern is one or two sentences.) W,~~~.~.
The licensee failed to properly evaluate the past operability of 4 questionable cells from battery 28007, Concern Background, Supporting Information, & Comments ,,,
The Cl claims that the licensee failed to use vendor expertise to evaluate tIe condition of four cells of a battery, thus failing to properly evaluate the past operabilityof the battery. 1(b)(7)(C) 7 Q:
(b)(7)(C) The individual stated an old battery bank (2B007) was replaced (by 2/3B00X) in June 2010. The old battery had four "red" cells for over six months
( Copper contamination causes the negative plates to appear red) and the concerned individual believed those cells should have been tested by a laboratory to determine past operability of the old battery.
However, the licensee performed a service test of only one cell (NMO8800524124) and concluded the battery would have performed its function.
Req R....-keb Requirement p 10 CFR 50.72; Technical Specification 3.8.4.3 Describe the concern's safety significance. .* .
Not an immediate safety concern - questionable cells were replaced Check each question as applicable to this concern.
X Is it a declaration, statement, or assertion of impropriety or inadequacy? Is there a potential deficiency?
X Isthe impropriety or inadequacy associated with NRC regulated activities or policy (e.g. SCWE)?
X Isthe validity of the issue unknown?
If all of the above statements are checked, the issue is an allegation.
- Technical Staff Recommendation(s)
Date Recommended Action Assigned Branch Planned Date 12/20/10 RPBD Inspect RPBD NOTE: Submilt Draft NOV, RFI qluestionslrequests, and/or an inspection plan as a sepa§rate document.
- For.an ARB decision to RFI, any INHIBITING FACTOR(S) that are overruled from the first page must have a justification documented In the ARB Decision(s). Document INHIBITING FACTOR(S) that not applicable to the concern or are not noted on first,page. First page reviewed? Yes: X No: NIA:
Accepted ARB Date ARB Decision(s) Assigned to Planned Date 01/04/11 Send Request for Information Letter ACES 01/07/11 01/04/11 Review licensee response EB2 inInformation accordanceinwith thisthe record was Act, exem p "oS , e 611/
Page 3 of 7
- Disiplie.: lectical*01 Priority:
While replacing non-vital charger 38005 and testing non-vital Battery 3B010, Bus 3D5A was de-energized, however associated power Panels 3D5P1, 3D5P2, 3D5P3 and 3D5P4 were energized using a temporary Concern:( power source. The licensee check did not & for grounds on the loads supplied from these panels during the aconcrn period with Spor sond.
this two enformation maintenance omet configuration.
(b)(7)(C)
-and believes
-[here may be grounded circuits which may go undetected, ")(7)(c)
Presently, 125 volt 3D5A DC bus (supported by 3B22 swing charger and 3B010 battery is provi ing power to 3D5P1, P2, P3 and P4 panels. [The] 3D5 DC bus has been isolated and de-energized for 3B011 battery performance test and replacement of 3B005 charger and inverter. Non-safety related 3D5P1-4 panels provide 125VDC control power to 480V load centers, 4.16kV switchgears, 6.9 switchgears, turbine trip panels, turbine trip unit actuators, excitation rectifiers, generator trip buses, emergency lighting panels, etc. During the rainy season, there is a high probability that some of these DC control circuits will be grounded during [the] Unit 3 refueling, as we proceed with maintenance/construction work. Unfortunately,
[the] 3D5A switch cabinet does not have any continuous ground detection and unless we rectify this deficiency, grounded circuits may stay undetected for a long time." The Cl was concerned the bus will be returned to its normal configuration on December 16, 2010, and the chance to identify the situation (groundid circuits) might be missed, and the opportunity to prevent future occurrences will be lost.
b)(7)(c) " "The most critical equipment supplied form these panels would be the protection circuits for the reserve auxiliary transformers. These transformers are presently supplying a tech spec required off-site power source to both Units 2 and 3. Allowing undetected grounds to develop in this protection circuitry could result in spurious tripping of the protection, causing a loss of off-site power to both units.
Undetected grounds could also prevent protection relays and breakers form tripping properly, which can lead to extensive equipment damage if an electrical fault should develop."
Requlatory Requirement i, -.. . ,,' ,.4 : .... . . .
Regulatory Guide 1.33 Describe the concern's safety significance.
Not an immediate safety concern Check each question as applicable to this concern.
X Is it a declaration, statement, 'orassertion of impropriety or inadequacy? Is there a potential deficiency? _
X Is the impropriety or inadequacy associated with NRC regulated activities or policy (e.g. SCWE)?
X Is the validity of the issue unknown?
If.allf:of the above statements are .checked,the issue is an allegation.
~~*Technical Staff Recommendation(s)
- Date Recommended Action Assigned Branch Planned Date 12/20/10 Inspect EB2
uoncer:S.
NOTE: Submit Draft NOV, RFi questionsirequests, and/or an inspection plan as a separate document.
- For an ARB decision to RFI, any INHIBITING FACTOR(S) that are overruled from the first page must have a justification documented in the ARB Decision(s). Document INHIBITING FACTOR(S) that not aDolicable to the concern or are not noted on first page. First page reviewed? Yes: X No: N/A:
Accepted ARB Date ARB Decision(s) Assigned to Planned Date 01/04/11 Send Request for Information Letter ACES 01/07/11 01/04/11 Review licensee response EB2
Page 5 of 7
- Discipline: I Corrective Action *01 Priority:
- Security Gate.orx *01 Priority S1W*I'_P0Basis: " __
Concern: (Aconcern is one or two sentences.) MOM.. .,.Ii .... ,,.* .=
- ...
- A ; i-, -
The licensee did not take prompt corrective actions to address Concern 2. Specifically, Notification 201158834 documented the concern on October 18, 2010, but no ground detection monitoring was performed until the maintenance was completed.
Concern Background, Supporting Information, & Comments .M "N!
(b)(7)(C)
"and believes there may be grounded circuits which may go undetec e . (b)(7)(C) _rresently, 125 volt 3D5A DC bus (supported by 3B22 swing charger and 3B010 battery is providing Power to 3D5P1, P2, P3 and P4 panels. [The) 3D5 DC bus has been isolated and de-energized for 3B01 1 battery performance test and replacement of 3B005 charger and inverter. Non-safety related 3D5P1-4 panels provide 125VDC control power to 480V load centers, 4.16kV switchgears, 6.9 switchgears, turbine trip panels, turbine trip unit actuators, excitation rectifiers, generator trip buses, emergency lighting panels, etc. During the rainy season, there is a high probability that some of these DC control circuits will be grounded during [the] Unit 3 refueling, as we proceed with maintenance/construction work, Unfortunately,
[the] 3D5A switch cabinet does not have any continuous ground detection and unless we rectify this deficiency, grounded circuits may stay undetected for a long time," The Cl was concerned the bus will be returned to its normal configuration on December 16, 2010, and the chance to identify the situation (grounded circuits) might be missed, and the opportunity to prevent future occurrences will be lost. The
.:. 7C The most critical equipment supplied form these panels would be the protection circuits for the reserve auxiliary transformers. These transformers are presently supplying a tech spec required off-site power source to both Units 2 and 3. Allowing undetected grounds to develop in this protection circuitry could result in spurious tripping of the protection, causing a loss of off-site power to both units.
Undetected grounds could also prevent protection relays and breakers form tripping properly, which can lead to extensive equipment damage if an electrical fault should develop."
egulatory Requirement , .:. . , .
10 CFR 50 Appendix B Criterion XVI Describe the concern's safety si~qnificance.
Not an immediate safety concern Check each question as applicable to this concern.
X Is it a declaration, statement, or assertion of impropriety or inadequacy? Is there a potential deficiency?
X Is the impropriety or inadequacy associated with NRC regulated activities or policy (e.g. SCWE)?
X Is the validity of the issue unknown?
If all of the above statements are checked, the issue is an allegation.
- Technical Staff Recommendation(s)
Date Recommended Action Assigned Branch Planned Date 12/20/10 Send Request for Information ACES 01/04/10 12/20/10 Review licensee response RPBD
t.,oncern: ,5. ..
NOTE: Submit Draft NOV, RFI questions/requests, and/or an inspection plan as a separate document.
- For an ARB decision to RFI, any INHIBITING FACTOR(S) that are overruled from the first page must have a Justification documented in the ARB Decision(s). Document INHIBITING FACTOR(S) that not applicable to the concern or are not noted on first page. First page reviewed? Yes: No: NIA:
Accepted ARB Date ARB Decision(s) Assigned to Planned Date 01/04/11 EB2 to Modify concern 3 EB2 01/04/11 01/04/11 Send Request for Information Letter ACES 01/07/11
'01/04/11 Review licensee response EB2
Page 7 of 7 i..
', or ;C+rl.eI
- RX Code or Functional Area: I Enciineerina
- Discipline: IEngineering 1*01 Priority:
- Security Categoa, - I -;.-F,+ -- prj,;.-,ý *01 Priority M MW2ýý'E -MM Basis, Concern: (A concern is one or two sentences.
Specific gravity measurements may not be compensated for temperature. Specifically, Notification 201190627 documented that the digital hydrometers used to measure specific gravity in station batteries do not automatically compensate the measurement for temperature, and prompt action was not taken to address this concern.
Concern Background, Supporting Information, & Comments I-The licensee's review of operating experience for applicability is noLtely, thus allowing the licensee to use a digital hydrometer that does not correct for temperature. Th {ftated-that Hope Creek identifig.d(( C) problem involving a digital hydrometer that did not automatically correct the specific gravity of a battery for temperature. All of the weekly, quarterly, and random surveillance test data had to be re-calculated. The ILb)(7 (C_ said SONGS used the same hydrometer (Anton Paar) as Hope Creek but Notificationl(b)(7)(C) does not have a start date until rbji7jýC) 10 CFR 50 Criterion XVI Describe the concern's safety significance. -(Ml.1i-tr N7-,
Not an immediate safety concern Check each question as applicable to this concern.
X Is it a declaration, statement, or assertion of impropriety or inadequacy? Is there a potential deficiency?
X Is the impropriety or inadequacy associated with NRC regulated activities or policy (e.g. SCWE)?
X Is the validity of the issue unknown?
If all of the above statements are checked, the issue is an allegation.
- Technical Staff Recommendationls)
Recommended Action Assigned Branch Planned Date 12/20/10 Send Request for Information ACES 01/04/10 12/20/10 Review licensee response RPBD _
NOTE: Submit Draft NOV, RFI questlonslfrequests, andlor an inspection plan as a separate document.
- For an ARB decision to RFI, any INHIBITING FACTOR(S) that are overruled from the first page must have a justification documented in the ARB Decision(s). Document INHIBITING FACTOR(S) that not applicable to the :,concern or are not noted on first page. First page reviewed? Yes: X No: NIA:
Accepted ARB Date ARS Decision(s) Assigned to Planned Date 01/04/11 EB2 to modify Concern 4 E82 01/04/11 01/04/11 EB2 to call licensee and inform of specific gravity testing EB2 01/04/11 methodology 01/04/11 Send Request for Information Letter ACES 01/07/11 01104111 Review licensee response EB2