05000346/LER-1978-083-03, /03L-1 on 780720:containment vessel-to-annulus Differential Pressure Exceeded Tech Spec Limit by 1 Inch. Purge of Containment Bldg Commenced.Caused by Inadequate Monitoring of Pressure Increase by Shift Check

/03L-1 on 780720:containment vessel-to-annulus Differential Pressure Exceeded Tech Spec Limit by 1 Inch. Purge of Containment Bldg Commenced.Caused by Inadequate Monitoring of Pressure Increase by Shift Check

ML19289D337
Person / Time
Site:	Davis Besse
Issue date:	08/15/1978
From:	Fulmer S TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19289D331	List: 05000346/LER-1978-066-99, /99X-1:on 780429,during Operation at 20% Power, RCS Pressure Dropped to Approx 1620 Psig & Safety Features Actuation Sys Channels 1 & 3 Tripped on RCS Low Pressure, Initiating Incident Levels 1 & 2 05000346/LER-1978-083-03, /03L-1 on 780720:containment vessel-to-annulus Differential Pressure Exceeded Tech Spec Limit by 1 Inch. Purge of Containment Bldg Commenced.Caused by Inadequate Monitoring of Pressure Increase by Shift Check 05000346/LER-1978-107-03, /03L-1 on 781031:during Diesel Generator Monthly Test,Room Temp Rose to 110 F & Outside Air Damper Would Not Open.Caused by Damper Linkage Being Out of Adjustment & Bound in Guide ML19289D330
References
LER-78-083-03L, LER-78-83-3L, NUDOCS 7903050347
Download: ML19289D337 (1)

LER-1978-083, /03L-1 on 780720:containment vessel-to-annulus Differential Pressure Exceeded Tech Spec Limit by 1 Inch. Purge of Containment Bldg Commenced.Caused by Inadequate Monitoring of Pressure Increase by Shift Check

Event date:
Report date:
3461978083R03 - NRC Website

text

NRC F ORM 3G6 (7 77)

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 1012 l l At 0820 hours0.00949 days <br />0.228 hours <br />0.00136 weeks <br />3.1201e-4 months <br /> on 7/20/78, it was noted that containment vessel to annulus differential j 10131 I pressure exceeded the TS 3.6.1.4 limit of +25 inches water gage by 1 inch water gage.

l Ccatain-l 1047 hours0.0121 days <br />0.291 hours <br />0.00173 weeks <br />3.983835e-4 months <br /> on 7/20/78, the purge of the containment building commenced.

l At o 4 1050 hours0.0122 days <br />0.292 hours <br />0.00174 weeks <br />3.99525e-4 months <br /> l l o l 3 l l ment vessel to annulus dif ferential pressure was within allowable limits at to the health and safety of the public or unit person g lo is l I on 7/20/78. There was no threat The slight increase above the TS limit would not cause containment vessel inter g g g l nel.

(NP-33-78-100) l l nal pressure to exceed the design pressure if a LOCA had occurred.

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