ML042080368
| ML042080368 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 11/24/2003 |
| From: | Hamer M Vermont Yankee |
| To: | Teras M, Wierzbowski G, Wonderlick A - No Known Affiliation, Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0267 | |
| Download: ML042080368 (3) | |
Text
Sienel, Beth From:
Hamer, Mike Sent:
Monday, November 24, 2003 6:46 PM To:
Wonderlick, Alex; Teras, Markus; Wierzbowski, George Cc:
Devincentis, Jim; Pelton, David; Sienel, Beth; Wamser, Chris; Bronson, Kevin
Subject:
PRO for CR-VTY-2003-02471 and 02389: Group Ill Isolations The events detailed in these CRS are reportable to the NRC as a 60-day telephone notification as an alternative to an LER for invalid actuations as provided in §50.73(a)(1). This PRO has been attached to CR-VTY-2003-02471 and is referenced in CR-VTY-2003-02389.
PRO-0302471.pdf (90 KB)
Mike Hamer Regulatory Compliance X3126 1
INTEROFFICE MEMORANDUM REGULATORY-COMPLIANCE POTENTIALLY REPORTABLE OCCURRENCE REPORT TO:
MIKE DESILETS, TECHNICAL SUPPORT MANAGER FROM:
MIKE HAMER, REGULATORY COMPLIANCE ANALYST
SUBJECT:
CR-VTY-2003-02389 & CR-VTY-2003-02471: Spurious Group III Isolation received from North Rx Building Vent Rad Monitor, (RM 17-452B).
DATE:
NOVEMBER 19, 2003 PRO NUMBER: PRO-0302471 EVENT DESCRIPTION:
On 10/31/03 with the reactor at full power, the North Reactor:Building Vent Exhaust Radiation Monitor (RM-17-452B) ERFIS momentarily spiked to approximately 25 mr/hr on ERFIS and approximately 100 mr/hr on the recorder for the reactor building. EOP-4 was entered and WR 03-509342 was written to perform troubleshooting. [CR-VTY-2003-02389]
On 1 1p83 a 15 mr/hr spike occurred on the same radiation monitor. Both of these events caused a Group Ill Isolation. The North Rx Building Vent Exhaust Radiation Monitor normally reads' approximately 2.5mr/hr to 6 mr/hr. The UfB" channel was also noted as being "noisy" when compared to the 'A' channel. In both events, the Group III Isolation went to completion and was restored with no complications. [CR-VrY-2003-02471]
The following regulation was considered when determining reportability of this event.
System Actuation
§50.73(a)(2)(iv) "[The licensee shall report-.]
(A) Any event or condition that resulted in manual or automatic actuation of any of the systems listed in paragraph (a)(2)(iv)(B) of this section, except when:
(1) The actuation resulted from and was part of a pre-planned sequence duringtesting or reactor operation; or (2) The actuation was invalid and; (i)
Occurred while the system was properly removed from service; or (ii)
Occurred after the safety function had already been completed.
(B) The systems to which the requirements of paragraph (a)(2)(iv)(A) of this section apply are:
(2) General containment isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs) 1
DISCUSSION/BASES:
NUREG 1022, Rev. 2 states:
'Except for critical scrams, invalid actuations are not reportable by telephone under § 50.72. In addition, invalid actuations are not reportable under § 50.73 in any of the following circumstances:
(A) The invalid actuation occurred when the system is already properly removed from service. This means all requirements of plant procedures for removing equipment from service have been met. It includes required clearance documentation, equipment and control board tagging, and properly positioned valves and power supply breakers.
(B) The invalid actuation occurred after the safety function has already been completed. An example would be RPS actuation after the control rods have already been inserted into the core."
The Group IlIl Isolations that occurred as a result of the radiation monitor spikes do not meet the exceptions for reporting as detailed above in NUREG 1022, Re. 2.
CONCLUSION:
These events are reportable to the NRC pursuant to §50.73(a)(2)(iv). As stated in 50.73(a)(1), "... the licensee may at its option, provide a "telephone notification" to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER".
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RECOMMENDED:
APPROVED:
/
Michael J! Hamer I
Regulatory Compliance Analyst ichael P.
sietsI Technical Support Manager Iat-e-01 Date Be 2