ML18149A209
| ML18149A209 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Surry, 05000000 |
| Issue date: | 07/03/1986 |
| From: | Hebdon F NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Jordan E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML18149A210 | List: |
| References | |
| AEOD-E607, NUDOCS 8607110299 | |
| Download: ML18149A209 (4) | |
Text
j e
UNITED STATES e
NUCLEAR REGULATORY COMMISSION WASHINGTON. D. C. 20555 July 3, 1986 MEMORANDUM FOR:
Edward L. Jordan, Director Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement FROM:
Frederick J. Hebdon, Deputy Director Office for Analysis and Evaluation of Operational Data AEOD/E607
SUBJECT:
DEGRADATION OR LOSS OF CHARGING SYSTEMS WITH SWING PUMP DESIGNS Enclosed is an AEOD engineering evaluation report concerning situations involving degradation or loss of charging systems using swing pump designs (i.e., its motor can be aligned to either of two electrical buses).
The report addresses such situations at Surry Unit 1 and Millstone Unit 2.
The situation at Surry Unit 1 was identified as a result of an event involving the total loss of the high head safety injection system while the plant was operating at 100 percent power.
The other situation was identified during testing on the Millstone Unit 2 simulator and involved the potential degradation of the charging system.
These situations were the result of deficiencies in attendant interlocking circuitry or maintenance procedures.
The associated safety concern is that the safety function of the charging system could be degraded or lost at a time when needed.
Although the review conducted for these situations did not identify any additional plants with these deficiencies, there are other plants with swing pump designs, and therefore, these or similar problems could exist elsewhere.
This is of particular concern because these types of deficiencies would not necessarily be detected during normal design reviews and/or routine testing.
For example, these deficiencies apparently existed at the above stations a number of years prior to being detected and corrected.
In view of this, it is suggested that the Office of Inspection and Enforcement issue an information notice which discusses the situations identified at Surry Unit 1 and Millstone Unit 2 involving degradation or loss of charging systems using swing pump designs.
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8607110299 860703 PDR ADOCK 05000280 S
e Edward If you or your staff have any questions concerning the enclosed engineering evaluation report, please contact Frank Ashe of my staff on extension x24442.
Enclosure:
As stated cc w/enclosure:
J. Sniezek, DEDROGR J. Taylor, IE R. Baer, IE A. Ignatonis, RII E. McCabe, RI C. Patel, NRR D. Jaffe, NRR M. Davis, RI, Surry G. Grant, RI, Millstone D. Humenansky, OCM
°1~ (),_ /JLL__
Frederick J. H~don, Deputy Director Oftice for Analysis and Evaluation of Operational Data
J"r' :
MEMORANDUM FOR:
Edward L. Jordan, Director Division of Emergency Preparedness FROM:
and Engineering Response Office of Inspection and Enforcement Frederick J. Hebdon, Deputy Director Office for Analysis and Evaluation of Operational Data
- July 3, 1986 AEOD/E607-
SUBJECT:
DEGRADATION OR LOSS OF CHARGING SYSTEMS WITH SWING PUMP DESIGNS Enclosed is an AEOD engineering evaluation report concerning situations involving degradation or loss of charging systems using swing pump designs (i.e., its motor can be aligned to either of two electrical buses).
The report addresses such situations at Surry Unit 1 and Millstone Unit 2.
The situation at Surry Unit 1 was identified as a result of an event involving the total loss of the high head safety injection system while the plant was operating at 100 percent power.
The other situation was identified during testing on the Millstone Unit 2 simulator and involved the potential degradation of the charging system.
These situations were the result of deficiencies in attendant interlocking circuitry or maintenance procedures.
The associated safety concern is that the safety function of the charging system could be degraded or lost at a time when needed.
Although the review conducted for these situations did not identify any additional plants with these deficiencies, there are other plants with swing pump designs, and therefore, these or similar problems could exist elsewhere.
This is of particular concern because these types of deficiencies would not necessarily be detected during normal design reviews and/or routine testing.
For example, these deficiencies apparently existed at the above stations a number of years prior to being detected and corrected.
In view of this, it is suggested that the Office of Inspection and Enforcement issue an information notice which discusses the situations identified at Surry Unit 1 and Millstone Unit 2 involving degradation or loss of charging systems using swing pump designs.
e Edward If you or your staff have any questions concerning the enclosed engineering evaluation report, please contact Frank Ashe of my staff on extension x24442.
Enclosure:
As stated cc w/enclosure:
J. Sniezek, DEDROGR J. Tay 1 or, I E R. Baer, IE A. Iqnatonis, RII E. McCabe, RI C. Patel, NRR D. Jaffe, NRR M. Davis, RI, Surry G. Grant, RI, Millstone
- See previous concurrence
/~/
Frederick J. Hebdon, Deputy Director Office for Analysis and Evaluation of Operational Data DISTRIBUTION:
PDR AEOD CF AEOD SF ROAB CF FAshe MChiramal SRubin Wlanning KBlack FHebdon CHeltemes