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As part of an extent of condition review r … As part of an extent of condition review related to ENS report 50362 (Unanalyzed Condition Due to Lack of Appropriate Fuse Protection), it was identified that, within the past three years, three additional examples existed of missing fire barriers that could have impacted separation of redundant safe shutdown trains. For the affected areas associated with each of the three missing barriers, compensatory measures (hourly fire watches) had been in place for three years prior to the discovery of the condition. However, it was determined the missing barriers met the reporting criteria for 10 CFR 50.72(b)(3)(ii)(B) as unanalyzed conditions that significantly degraded plant safety.</br>The first condition was the use of rodofoam material in Auxiliary Building seismic joint seals. Rodofoam is a combustible foam material and does not provide a fire rating equivalent to the barriers in which it was used. This issue was corrected in a plant modification.</br>The second condition is the lack of required fire dampers in ventilation supply ducts to the Aux. Feedwater (AFW) Pump Rooms (Fire areas 31 and 32). An engineering change package has been approved to implement a plant modification to install the required dampers as part of the NFPA-805 transition.</br>The third condition is a gap where the ventilation duct passes through the wall from the Bus 150/160 room into the AFW pump room. An engineering change package has been approved to implement a plant modification to correct this condition as part of the NFPA-805 transition. </br>The protection of the health and safety of the public was not affected by this issue. In all cases, compensatory measures existed to ensure the protection of safe shutdown equipment. </br>The licensee has notified the NRC Senior Resident Inspector.</br>* * * UPDATE FROM DOUG LARSON TO DANIEL MILLS AT 2122 EST ON 11/18/14 * * *</br>Northern States Power Company (NSPM) has determined that the missing fire damper and the wall gap (the second and third identified conditions) are not separating redundant equipment and no longer meet the regulatory definition of an unanalyzed condition. This was identified when it was determined that the redundant pressurizer heater cables credited for safe shutdown were routed through the same fire area. This was reported under EN 50531 (Unanalyzed Condition Due To Missing Fire Barrier). Since the missing fire barrier does not separate redundant equipment, the condition does not degrade plant safety, and is no longer reportable.</br>The protection of the health and safety of the public was not affected by this issue.</br>The licensee has notified the NRC Resident Inspector.</br>Notified R3DO (Peterson).ident Inspector.
Notified R3DO (Peterson).
18:53:00, 19 September 2014 +
50,475 +
17:54:00, 19 September 2014 +
18:53:00, 19 September 2014 +
As part of an extent of condition review r … As part of an extent of condition review related to ENS report 50362 (Unanalyzed Condition Due to Lack of Appropriate Fuse Protection), it was identified that, within the past three years, three additional examples existed of missing fire barriers that could have impacted separation of redundant safe shutdown trains. For the affected areas associated with each of the three missing barriers, compensatory measures (hourly fire watches) had been in place for three years prior to the discovery of the condition. However, it was determined the missing barriers met the reporting criteria for 10 CFR 50.72(b)(3)(ii)(B) as unanalyzed conditions that significantly degraded plant safety.</br>The first condition was the use of rodofoam material in Auxiliary Building seismic joint seals. Rodofoam is a combustible foam material and does not provide a fire rating equivalent to the barriers in which it was used. This issue was corrected in a plant modification.</br>The second condition is the lack of required fire dampers in ventilation supply ducts to the Aux. Feedwater (AFW) Pump Rooms (Fire areas 31 and 32). An engineering change package has been approved to implement a plant modification to install the required dampers as part of the NFPA-805 transition.</br>The third condition is a gap where the ventilation duct passes through the wall from the Bus 150/160 room into the AFW pump room. An engineering change package has been approved to implement a plant modification to correct this condition as part of the NFPA-805 transition. </br>The protection of the health and safety of the public was not affected by this issue. In all cases, compensatory measures existed to ensure the protection of safe shutdown equipment. </br>The licensee has notified the NRC Senior Resident Inspector.</br>* * * UPDATE FROM DOUG LARSON TO DANIEL MILLS AT 2122 EST ON 11/18/14 * * *</br>Northern States Power Company (NSPM) has determined that the missing fire damper and the wall gap (the second and third identified conditions) are not separating redundant equipment and no longer meet the regulatory definition of an unanalyzed condition. This was identified when it was determined that the redundant pressurizer heater cables credited for safe shutdown were routed through the same fire area. This was reported under EN 50531 (Unanalyzed Condition Due To Missing Fire Barrier). Since the missing fire barrier does not separate redundant equipment, the condition does not degrade plant safety, and is no longer reportable.</br>The protection of the health and safety of the public was not affected by this issue.</br>The licensee has notified the NRC Resident Inspector.</br>Notified R3DO (Peterson).ident Inspector.
Notified R3DO (Peterson).
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100 +
00:00:00, 18 November 2014 +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
01:49:11, 2 March 2018 +
17:54:00, 19 September 2014 +
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18:53:00, 19 September 2014 +
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