ML20129H722

Submits Statement Re Sequence of Events Involving Lost of RHR

ML20129H722
Person / Time
Site:	Vogtle
Issue date:	10/28/1991
From:	Evans B AFFILIATION NOT ASSIGNED
To:	NRC
Shared Package
ML082401288	List: 05000424/LER-1950-424, Forwards LER 50-424/1990-08S Re Unsecured Safeguards Info Due to Personnel Error 05000424/LER-1990-007, S-00:on 900829,safeguards Info Container Observed Unsecured & Unattended in Document File Room.Caused by Safeguards Info Coordinator Failure to Secure Container Before Going to Lunch.Coordinator Counseled & Reprimanded 05000424/LER-1990-008, S-00:on 901011,eleven Documents Found Unattended & Unsecured in Folder on Desk Being Moved.Caused by Cognitive Personnel Error.Safeguards Documents Returned to Their Approved Storage Container ELV-01657, Forwards LER Re Personnel Error Leading to Unsecured Safeguards Info.Ler Withheld ELV-02121, Forwards LER Re Personnel Error Leading to Unsecured Safeguards Info on 900829.Rept Withheld ELV-03114, Forwards Responses to Sections I-IV of Additional Suppl to 910708 Suppl to 900911 Petition of M Hobby & Mosbaugh ELV-03148, Requests That Supplemental Response to NRC Demand for Info Be Withheld from Placement in PDR Per 10CFR2.790 Until Decision Is Made in Matter & Responds to Questions Not Previously Addressed IR 05000424/1990016 IR 05000425/1990027 ML20127B919 ML20127B929 ML20127B932 ML20127B936 ML20127B941 ML20127B945 ML20129H615 ML20129H661 ML20129H664 ML20129H678 ML20129H691 ML20129H696 ML20129H706 ML20129H722 ML20129H733 ML20129H737 ML20129H747 ML20129H753 ML20129H757 ML20129H766 ML20129H776 ML20129H779 ML20129H789 ML20129H792 ML20129H795 ML20129H805 ML20129H814 ML20129H820 ML20129H825 ML20129H830 ML20129H840 ML20129H846 ML20129H851 ML20129H856 ML20129H861 ML20129H872 ML20129H874 ML20129H879 ML20129H882 ML20129H888 ML20129H893 ... further results
References
FOIA-95-211 NUDOCS 9611040015
Download: ML20129H722 (2)

Text

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f LOSS OF RHR SEQUENCE OF EVENTS Saturday night, October 26, 1991.

Reactor cavity draining in progress per DOP 12000-C and SOP 13033-1.

RHR

'B' aligned for coolant circulation & cooling and providing letdown to VCT.

RHR

'A' aligned for draining cavity to RWST.

At approximately 197' elevation as indi-cated on 1-LG-10401, cavity draining rate was decreased from approximately 2500 GPM to about 800 GPM.

At approx. 2200 hrs EDT received annunciator ALB 06 D03 "ACCUM i4 HI/LO LEVEL".

I observed lLI-957 indicating at top of scale (100%).

I then tapped on lLI-957 and it's indi-cation decreased to 60%.

Mike Henry then closed 1-HV-8716A and opened 1HV-8809A.

Site glass indication was reported as approx. 194', tygon hose indicated 194' and visual check was reported as level at Rx vessel flange.

C. Ladd, M. Henry and myself, after consulting I&C, discussed the validity of ILI-957 indication.

We then decided to reinitiate flow and continue draining to 192' elev.

M. Henry reopened lHV-8716A, closed g

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1HV-8809A and established approx. 750 GPM flow 3f}

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to the RWST.

At approx. 2235 hrs EDT I observed RHR pump

'B' flow oscillation and pressure de-

^

7 crease.

As flow & pressure decreased to zero GPM/

g*

PSIG, I closed lHV-607 and 1FV-619 resulting in RHR

'B' running o& mini-flow.

M. Henry then closed lHV-8716A and we realigned RHR

'A' to refill the cavity from the RWST.

At this time lLI-957 was indicating approx. 32%.

Vessel was reported as approx. l' below the flange.

Site glass indi-j {,

6 cation reported as 193'.

As vessel level increased RHR

'B' pressure began to increase.

At approximately g

193'4" site glass indication, I restored RHR

'B' flow to approx. 1000'UPM.

The aux. bldg. operator 9611040015 960827 ighf

/o/26 PDR FOIA KOHN95-211 PDR

Pg. 2 t

reported no indications of cavitation at RHR l

pump 'B'._

we stopped filling cavity from RWST via RHR

'A' at. approx. 194' per site glass.

At approx. 2310 hrs cavity level reported as stable at 194'5".

At 2316 hrs RHR

'B' flow was restored to 3000 GPM.

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