SBK-L-15183, LER, Seabrook Station - Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days

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LER, Seabrook Station - Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days
ML15287A397
Person / Time
Site: Seabrook  NextEra Energy icon.png
Issue date: 09/25/2015
From: Ossing M
NextEra Energy Seabrook
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
SBK-L-15183
Download: ML15287A397 (4)
v • d • e


Text

ENERGYra September 25, 2015 SBK-L-15 183 Docket No. 50-443 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Seabrook Station Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days The enclosed special report is being submitted pursuant to the requirements of Seabrook Technical Specification 3.3.3.1, Action b, Table 3.3-6, Action 27 and Technical Specification 6.8.2.

Alternate means of radiation monitoring were implemented in accordance with the Technical Specification ACTION statement.

If you have any questions regarding this report, please contact me at (603) 773-7512.

Sincerely, NextEra Energy Seabrook, LLC Licensing Manage, cc: D. Dorman, NRC Region I Administrator J.G. Lamb, NRC Project Manager, Project Directorate 1-2 P. Cataldo, NRC Senior Resident Inspector NextEra Energy Seabrook, LLC, P.O. Box 300, Lafayette Road, Seabrook, NHl 03874

Enclosure to SBK-L- 15 183 Seabrook Station

  • Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days

t0" SBK-L-15 183 Enclosure Page 1 of 2 I. TITLE Main Steam Line Radiation Monitor 1-RM-RM 648 1-1 Inoperable Greater than 7 Days II. EVENT DESCRIPTION On September 14, 2015, while in Mode 1 at 100% power, the 'A' Main Steam Radiation Monitorl-RM-RM-6481-1 trended up into ALERT and then into ALARM. Confirmatory samples showed no reason for the elevated readings and the radiation monitor was removed from service. The limiting condition for operation (LCO) for TS 3.3.3.1, Action b., Table 3.3-6, Action 27 states that:

"With the number of OPERABLE Channels less than the Minimum Channels OPERABLE requirement, initiate the preplanned alternate method of monitoring the appropriate parameter(s), within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and:

1) either restore the inoperable Channel(s) to OPERABLE status within 7 days of the event, or
2) prepare and submit a Special Report to the Commission pursuant to Specification 6.8.2 within 14 days following the event outlining the actions taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status."

The preplanned alternate method of monitoring the appropriate parameter was implemented and Work Order (WO) 40410443 initiated for troubleshooting and repair activities. On September 21, 2015, troubleshooting efforts to repair the radiation monitor were unsuccessful and the 7-day time to restore the subject radiation monitor to operable status expired.

III. CAUSE OF THE EVENT The 'A' Main Steam Line radiation monitor has been declared inoperable due to spiking on the channel. Troubleshooting activities have not yet determined the cause of the spiking.

IV. ACTIONS TAKEN In accordance with the WO 40410443 troubleshooting plan, short term actions were performed to implement the preplanned method of monitoring the appropriate parameter in accordance with TS 3.3.3.1, Action b., Table 3.3-6, Action 27, evaluate potential test points for recorder hook-up, clean connectors at the detector and install a temporary recorder on the 1-RM-RM-648 1 "A" Main Steam Line rad monitor to assist in troubleshooting. A replacement High Voltage Power Supply (HVPS) was installed and an AMS Noise Monitoring survey scheduled for September 29, 2015 through September 30, 2015.

A new detector is being procured in accordance with the troubleshooting efforts continuing under WO 40410443.

SBK-L- 15 183 Enclosure Page 2 of 2 V. SCHEDULE FOR RESTORING SYSTEM Monitor performance subsequent to the power supply change is being evaluated and preliminary data indicates the replacement has improved performance. A replacement detector has been ordered in the event further troubleshooting reveals the detector as a likely cause. The expected delivery date for the new detector is November 13, 2015 with installation and testing to follow.

If Main Steam Line Radiation Monitor 1-RM-RM 6481 is not restored to service by November 27, 2015, an update will be provided.

ENERGYra September 25, 2015 SBK-L-15 183 Docket No. 50-443 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Seabrook Station Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days The enclosed special report is being submitted pursuant to the requirements of Seabrook Technical Specification 3.3.3.1, Action b, Table 3.3-6, Action 27 and Technical Specification 6.8.2.

Alternate means of radiation monitoring were implemented in accordance with the Technical Specification ACTION statement.

If you have any questions regarding this report, please contact me at (603) 773-7512.

Sincerely, NextEra Energy Seabrook, LLC Licensing Manage, cc: D. Dorman, NRC Region I Administrator J.G. Lamb, NRC Project Manager, Project Directorate 1-2 P. Cataldo, NRC Senior Resident Inspector NextEra Energy Seabrook, LLC, P.O. Box 300, Lafayette Road, Seabrook, NHl 03874

Enclosure to SBK-L- 15 183 Seabrook Station

  • Technical Specification Special Report Radiation Monitor Inoperable Greater than 7 Days

t0" SBK-L-15 183 Enclosure Page 1 of 2 I. TITLE Main Steam Line Radiation Monitor 1-RM-RM 648 1-1 Inoperable Greater than 7 Days II. EVENT DESCRIPTION On September 14, 2015, while in Mode 1 at 100% power, the 'A' Main Steam Radiation Monitorl-RM-RM-6481-1 trended up into ALERT and then into ALARM. Confirmatory samples showed no reason for the elevated readings and the radiation monitor was removed from service. The limiting condition for operation (LCO) for TS 3.3.3.1, Action b., Table 3.3-6, Action 27 states that:

"With the number of OPERABLE Channels less than the Minimum Channels OPERABLE requirement, initiate the preplanned alternate method of monitoring the appropriate parameter(s), within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and:

1) either restore the inoperable Channel(s) to OPERABLE status within 7 days of the event, or
2) prepare and submit a Special Report to the Commission pursuant to Specification 6.8.2 within 14 days following the event outlining the actions taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status."

The preplanned alternate method of monitoring the appropriate parameter was implemented and Work Order (WO) 40410443 initiated for troubleshooting and repair activities. On September 21, 2015, troubleshooting efforts to repair the radiation monitor were unsuccessful and the 7-day time to restore the subject radiation monitor to operable status expired.

III. CAUSE OF THE EVENT The 'A' Main Steam Line radiation monitor has been declared inoperable due to spiking on the channel. Troubleshooting activities have not yet determined the cause of the spiking.

IV. ACTIONS TAKEN In accordance with the WO 40410443 troubleshooting plan, short term actions were performed to implement the preplanned method of monitoring the appropriate parameter in accordance with TS 3.3.3.1, Action b., Table 3.3-6, Action 27, evaluate potential test points for recorder hook-up, clean connectors at the detector and install a temporary recorder on the 1-RM-RM-648 1 "A" Main Steam Line rad monitor to assist in troubleshooting. A replacement High Voltage Power Supply (HVPS) was installed and an AMS Noise Monitoring survey scheduled for September 29, 2015 through September 30, 2015.

A new detector is being procured in accordance with the troubleshooting efforts continuing under WO 40410443.

SBK-L- 15 183 Enclosure Page 2 of 2 V. SCHEDULE FOR RESTORING SYSTEM Monitor performance subsequent to the power supply change is being evaluated and preliminary data indicates the replacement has improved performance. A replacement detector has been ordered in the event further troubleshooting reveals the detector as a likely cause. The expected delivery date for the new detector is November 13, 2015 with installation and testing to follow.

If Main Steam Line Radiation Monitor 1-RM-RM 6481 is not restored to service by November 27, 2015, an update will be provided.

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