ML20084H669
| ML20084H669 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 06/15/1971 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084H673 | List: |
| References | |
| 13248, 2819, NUDOCS 8305040718 | |
| Download: ML20084H669 (2) | |
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June 15, 3 9'll
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Dr. Peter A. Morris, Director
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United Statec Atomic Energy Comniccion
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l Dear Dr. Morrin.
Subject:
Oyster Creek Station Docket 50-219 Collapse of the Package Boiler Flue The purpoce of thic letter is to report, an a matter of interect, the known details on the collapse of the package boiler fl ue. The 30-inch transite flue was crected incide the plant's I
vont ilation ntuck.
It penetrated the ventilation stuck at approxi-rutely elevution 36 feet. and ran inside the atack to within 10 inches of the top.
Its purpose uno to carry off the combuction gaces from l
the packare boiler.
It. van cuppcrted by ctainlecc cteel metal bands and cable <., which were anchored into the main stack.
The eventc which 3 ed up to the diceovery of the collapce and the cubcequent actions taken are described below.
At elevation 264 feet there is an icokinetic probe installed
- in the plant ventilation atack fcr the purpoce of car.pling all building ventilating air am] alno the air ejector off giaren af ter hold up.
A canpl e in draw:. through the probe by a scenp]e pu:op Iccated in the pachat;e boil er houce.
'lh ! ". n a'nple i n filtered for particulatec and halogeno, then paenen by two ceintillation detectora before returning to the ctack.
In ifebruary of 1971 there vore slight traceu of carbon l
found on the etack ncep e ayuten perticulate fi] Lera.
Filter changing j
i in done on a rcutine basic unlean a J ov flow alarm indicateu the filter l
ir pluminr; at which time the filter in changed earlier thnn usual.
The ea" bon deponitt weze not neen every time a filter vna chanc,cd.
It van thought at. thiu tjae that the boiler flue could poacibly have a crack in it te'ov tl..
20h-fcot clc yation; and kith the boi]er firing at a J
ruch higher rnt.e due to the vinter heat.in ; loaa and the une of the war.te eeneentrator, it rny have cauced occucional pericd3 of poaitive pre: nure reuulting in ecnbum. ion productr entering the icekinetic prou k,
2 58 N7I 8305040718 710615 PDR ADOCK 05000219 S
PDR 2819I 4-O COPY SENT REGION m
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Dr. Peter A. Morri c Page II June 15, 1971 The problem became more severe when on April 22, 1971 it became necessary to replace a pluEged filter that had been in service fcr only one day.
The replacement filter ves removed and inspected after one hour and was found to be coated with a heavy deposit of c arbon.
The package boiler was then shut down, and it was decided to enter the main atack to investigate the source of leakage. The package boiler flue was found to be almost completely collapsed.
The collapse of the flue has resulted in minor damage to the supporting structure of the stack gas probe as the result of falling material striking the supporting beam and trolly used to hold the isokinetic probe in position.
The probe was observed to be bent and disconnected from the supporting structure. However, as evidenced by the stack gas recording charts, the isokinetic probe is still performing its intended function since the readings are found to compare favorably with prior data. Ucv filters had been placed in service following the package boiler shutdown on April 22, 1971. On April 26, 1971 the particulate and halogen filters were removed and counted following routine plant counting procedures, and evaluated with previous collection data for com-parison purposes. No discrepancies were observed and it was concluded that no degradation of the efficiency of the stack gas cample system has occurred. At the next outage of suitable duration, the isokinetic probe vill be examined and resupported or repaired as required.
Action was taken immediately to construct a temporary
, flue for the package boiler, outside of the ventilation stack, in order to return the boiler and the vaste concentrator to service as soon an possible.
The new flue was installed and the boiler returned to cervice on April 26, 1971.
Twenty-five copies of this report are attached.
Very truly yours, OSP l
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I Ivan R. Pinf1;8ck, J..
Manager, Nuclear Generating Stations IRF/pk cc: Mr R. W. Kirkmun, Regional Director Division of Compliance L
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