ML19259C875: Difference between revisions

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CENTRAL FILES PDR:HQ M@
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s      .
s      .
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,,  s Request 5.c    The methods and sensitivity of detection of feedwater leaks in containment.
      '.-
Request 5.c    The methods and sensitivity of detection of feedwater leaks in containment.
Resptase:      The methods for the detection of feedwater leaks in contain-ment are as follows:
Resptase:      The methods for the detection of feedwater leaks in contain-ment are as follows:
: a. Containment sump level
: a. Containment sump level
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In addition to the installed instrumentation, containment inspections are made on a periodic basis which would aid in identi fication of fecdwater leaks.
In addition to the installed instrumentation, containment inspections are made on a periodic basis which would aid in identi fication of fecdwater leaks.
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ifs T. E.'Short Assistant General Manager TES/KJM/BJH: cb cc:  IIRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 LeBoeuf, Lamb, Leiby & MacRae 1333 flew Hampshi re Avenue, fl.W.
ifs T. E.'Short Assistant General Manager TES/KJM/BJH: cb cc:  IIRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 LeBoeuf, Lamb, Leiby & MacRae 1333 flew Hampshi re Avenue, fl.W.
Washington, D. C. 20036 L 63.C 3}}
Washington, D. C. 20036 L 63.C 3}}

Latest revision as of 22:57, 1 February 2020

Responds to IE Bulletin 79-13 Re Feedwater Line Break Accidents.Submits Info Re Insp Schedule,Adequacy of Operating & Emergency Procedures & Methods & Sensitivity of Detection of Leaks in Containment
ML19259C875
Person / Time
Site: Fort Calhoun Omaha Public Power District icon.png
Issue date: 07/13/1979
From: Short T
OMAHA PUBLIC POWER DISTRICT
To: Seyfrit K
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
NUDOCS 7908160038
Download: ML19259C875 (2)


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NSIC Omaha Public Power District 1623 HARNEV a OMANA, NEDRASKA 68102 m TELEPHONE 536 4000 AREA CODE 402 July 13,1979 Mr. K. V. Seyfrit, Director U. S. Nuclear Regulatory Conmission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011 Referen ce: Docket No. 50-285 IE Bulletin 79-13 June 25, 1979 Gentlemen:

In response to item 5 of the referenced bulletin, the Omaha Public Power District submits the following information:

Request 5.a Your schedule for inspection if required by item 1.

Response: The next scheduled outage for the Fort Calhoun Station is in January 1980 for a refueling which is approximately only 90 days af ter the latest date to perform the inspections required by this bulletin; however, the District is making arrangements to shut down the station on September 23, 1979 to perform these inspections. If an outage occurs prior to September 23, 1979, and if it is practical to perform the inspections during that outage, the inspections required by iter,, I will be performed at that time.

Request 5.b The adequacy of your operating and emergency procedures to recognize and respond to a feedaater line break accident.

Response: The present emergency procedures at Fort Calhoun Station are adequate to recognize and respond to a feedwater line break accident. The current procedures for an uncontrolled heat extraction (EP-6) and loss of feedwater (EP-7) would give the operator guidance in responding to a feedwater line break inside containment either upstream or downstream of the check valves FW-160 and FW-161.

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,, s Request 5.c The methods and sensitivity of detection of feedwater leaks in containment.

Resptase: The methods for the detection of feedwater leaks in contain-ment are as follows:

a. Containment sump level
b. Contai nment humidity (dewpoint)
c. "ontainment pressure
d. Steam generator level
e. Steam generator pressure The parameters for detection of feedwater leaks in contain-nent are listed in their relative order of sensitivity. The sensitivity of the containment sump is approximately 1 gpm and tha containment dewpoint instrumentation can detect leaks of approximately 3 gpm. These values are referenced in the Final Safety Analysis Report for Fort Calhoun Station in Section 4.3.14.

The combination of the above indicatiens would allow the operator to diagnosa a feedwater line break in containment and initiate timely corrective actions. These parameters are recorded by the operations staff on a regular basis.

In addition to the installed instrumentation, containment inspections are made on a periodic basis which would aid in identi fication of fecdwater leaks.

S in c.e rely ,

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ifs T. E.'Short Assistant General Manager TES/KJM/BJH: cb cc: IIRC Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C. 20555 LeBoeuf, Lamb, Leiby & MacRae 1333 flew Hampshi re Avenue, fl.W.

Washington, D. C. 20036 L 63.C 3