ML19340A452: Difference between revisions
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,a '*- LCENSEE | ,a '*- LCENSEE | ||
* UCENSE EVENT | * UCENSE EVENT | ||
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NAME | NAME | ||
* LICENSE NUMBER - TYPE TYPE ' | * LICENSE NUMBER - TYPE TYPE ' | ||
- ] l F li, l- Q R l P l 3 l l0lul-l0l0l0l0l0l-l0l0l l 4 l 1 l1 l1 l1 l l0 l4 l 89- 14 15 , 25 26 - 30 31 32 2 | - ] l F li, l- Q R l P l 3 l l0lul-l0l0l0l0l0l-l0l0l l 4 l 1 l1 l1 l1 l l0 l4 l 89- 14 15 , 25 26 - 30 31 32 2 | ||
"@ E74; | "@ E74; CATECo. - T oocuT NUMsER EvENr n.TE = oRr o.TE 3 CONT l -l "l . | ||
8 57 58 l0 l5 l0 l-l0-l3 l0 l2 l l0 l9 l0 l7 l 7l 7l 7 l 0 l 9 l1 l5 l7 l 7-59 - 60 61 68 69 74 7 E EVENT DESCRIPTON - | |||
8 57 58 | |||
l0 l5 l0 l-l0-l3 l0 l2 l l0 l9 l0 l7 l 7l 7l 7 l 0 l 9 l1 l5 l7 l 7-59 - 60 61 68 69 74 7 E | |||
EVENT DESCRIPTON | |||
- | |||
] l In mode 1 operation, an unplanned radioactive gas release to the Turbine Building occurred i' 'S 9 | ] l In mode 1 operation, an unplanned radioactive gas release to the Turbine Building occurred i' 'S 9 | ||
*I | *I | ||
Line 49: | Line 39: | ||
~j [ of this cause. | ~j [ of this cause. | ||
4 ' | 4 ' | ||
(LER 77-107E) 39 pnug . E-system , causE coupoNENT COMPONENT 3 CODE CODE - COMPONENT COCE .SUPPUER MANUFACTURER VOLATON l j 'Pl Al y 39 10 , | |||
(LER 77-107E) | |||
39 pnug . E-system , causE coupoNENT COMPONENT 3 CODE CODE - COMPONENT COCE .SUPPUER MANUFACTURER VOLATON l j 'Pl Al y 39 10 , | |||
11 12 l Vl Al Ll Yl El Xl 17 | 11 12 l Vl Al Ll Yl El Xl 17 | ||
@ 43 l A l 6l 1l 0l 44 47 W 48 | @ 43 l A l 6l 1l 0l 44 47 W 48 l | ||
CAUSE DESCRIPTON 0.- | |||
l l l' While performing maintenance on the Eydrogen Supply System, radioactive gas from the | l l l' While performing maintenance on the Eydrogen Supply System, radioactive gas from the | ||
:- 19 - | :- 19 - | ||
' E .' | ' E .' | ||
lf9l Makeup-Tank, leaked by valves MUV-142 and MUV--143 and to the Turbine Building via ve ; | lf9l Makeup-Tank, leaked by valves MUV-142 and MUV--143 and to the Turbine Building via ve ; | ||
Line 70: | Line 52: | ||
W' RELEASED AMOUNT cF ACTMTV LoCATON oF prira*F i | W' RELEASED AMOUNT cF ACTMTV LoCATON oF prira*F i | ||
W 9 | W 9 | ||
OF RELEASE l 185 ' curies noble gasl 10 | OF RELEASE l 185 ' curies noble gasl 10 l Release to Turbine Bldg vent to atmosphere 45 11 , | ||
44 BC PERSONNEL- EXPOSURES NUMtER TYPE DESCRIPTION 9 | |||
l Release to Turbine Bldg vent to atmosphere 45 | |||
11 , | |||
44 BC | |||
l0 l0 l0l -W 11 12 l | l0 l0 l0l -W 11 12 l | ||
13 NA | 13 NA | ||
. SC PERSONNEL INJURIES | . SC PERSONNEL INJURIES | ||
* NUMC54 ' OESCRIPTON ' | * NUMC54 ' OESCRIPTON ' | ||
.l0l0l0l 9 | .l0l0l0l 9 | ||
l NA* | l NA* | ||
I 11 12 , | |||
11 12 , | |||
6C OFFSITE - CONSEQUENCES | 6C OFFSITE - CONSEQUENCES | ||
, l NA * | |||
, l | * 9 . | ||
NA * | |||
9 . | |||
80 ~ | 80 ~ | ||
f "JSS. OR DAMAGE TO FACIUTY . | f "JSS. OR DAMAGE TO FACIUTY . | ||
TYPE DESCRIPTON . | TYPE DESCRIPTON . | ||
a W 'l10 - | a W 'l10 - | ||
NA | NA cc, l | ||
cc, l | |||
. PUBUCITY - - | . PUBUCITY - - | ||
NA. | |||
l . . | l . . | ||
ll ADDITIONAL FACTORS l' ~ and sol'onoid valves for boundary isolation | ll ADDITIONAL FACTORS l' ~ and sol'onoid valves for boundary isolation | ||
.800326079[ wl g , .. ou | |||
.800326079[ wl | |||
g , .. ou | |||
!l | !l | ||
-l SEE ATTACHED SUPPLEMENTARY INFORMATION * | -l SEE ATTACHED SUPPLEMENTARY INFORMATION * | ||
,m -W. P'. Stewart 1) PHONE: 813/866-4159 c yy ... ......T 1 | |||
,m -W. P'. Stewart 1) PHONE: 813/866-4159 | |||
c yy ... ......T 1 | |||
. _ , - ._ ----- __-- - - ~ ~ - - - . _ - - - - - - - , < | . _ , - ._ ----- __-- - - ~ ~ - - - . _ - - - - - - - , < | ||
, , _ - . _ _ . . - _ _ . ~ - | , , _ - . _ _ . . - _ _ . ~ - | ||
P | P | ||
. . . . 1 | . . . . 1 | ||
.~. l | .~. l | ||
. 1 | . 1 | ||
. \ | . \ | ||
l SUPPLEMENTARY INFORMATION - | l SUPPLEMENTARY INFORMATION - | ||
l Report No.: 50-302 /77-107E Facility: Crystal River Unit #3 Report Date: 15 September 1977 | l Report No.: 50-302 /77-107E Facility: Crystal River Unit #3 Report Date: 15 September 1977 Occurrence Date: 7 September 1977 Identification of Occurrence: , | ||
. l An unplanned radioactive gas release reported in accordance with Environmental ) | |||
Occurrence Date: 7 September 1977 Identification of Occurrence: , | |||
. l | |||
An unplanned radioactive gas release reported in accordance with Environmental ) | |||
. Technical Specification 5.6.2. (A) . | . Technical Specification 5.6.2. (A) . | ||
Conditions Prior to Occurrence: | Conditions Prior to Occurrence: | ||
1 Mode 1 power operation in the process of performing maintenance on the Hydrogen ' | 1 Mode 1 power operation in the process of performing maintenance on the Hydrogen ' | ||
Supply System. , | Supply System. , | ||
Description of Occurrence: ' | Description of Occurrence: ' | ||
At 1605 the condenser vacuum pump exhaust radiation monitor RMA-12 high alarmed. An intensive investigation for a primary to secondary leak began and at 0230 on 8 September 1977 it was determined that instead of a primary to secondary leak, a radioactive gas release was being made to the Turbine Building via the Hydrogen Supply System. Further investigation revealed that maintenance was being performed on the Hydrogen Supply | At 1605 the condenser vacuum pump exhaust radiation monitor RMA-12 high alarmed. An intensive investigation for a primary to secondary leak began and at 0230 on 8 September 1977 it was determined that instead of a primary to secondary leak, a radioactive gas release was being made to the Turbine Building via the Hydrogen Supply System. Further investigation revealed that maintenance was being performed on the Hydrogen Supply System. The H2 System was found isolated from the Makeup tank by closing Makeup valves MUV-142 and 143 and was vented by opening Hydrogen Valve HYV-25. Noble gas, pri:aarily Xenon 133 from the Makeup Tank was leaking by valves MUV-142 and MUV-143 and into the Turbine Bu'.lding via vent valve HYV-25. After a pe . 'od of 12 hours and 40 minutes vent valve HYV-25 wao cloud and the gas release was terminated. A total of 185 curies of noble gas was released. The instantaneous release rate was .32% of the most restrictive limit set forth in Environmental Technical Specification 2.4.2. A(1). | ||
System. The H2 System was found isolated from the Makeup tank by closing Makeup valves MUV-142 and 143 and was vented by opening Hydrogen Valve HYV-25. Noble gas, pri:aarily Xenon 133 from the Makeup Tank was leaking by valves MUV-142 and MUV-143 and into the Turbine Bu'.lding via vent valve HYV-25. After a pe . 'od of 12 hours and 40 minutes vent valve HYV-25 wao cloud and the gas release was terminated. A total of 185 curies of noble gas was released. The instantaneous release rate was .32% of the most restrictive limit set forth in Environmental Technical Specification 2.4.2. A(1). | |||
Designat1un of Apparent Cause: | Designat1un of Apparent Cause: | ||
The cause of this event has been determined to be radioactive gas from the Makeup Tank leaking by H 2 check valve MUV-142, H stop valve MUV-143 and into Turbine Building via | The cause of this event has been determined to be radioactive gas from the Makeup Tank leaking by H 2 check valve MUV-142, H stop valve MUV-143 and into Turbine Building via | ||
Line 165: | Line 102: | ||
for the entire period of the release. , | for the entire period of the release. , | ||
':orrective Action: | ':orrective Action: | ||
All concerned personnel have been cautioned and instructed not to rely on check or solonoid valves for boundary. isolations. Manual valves will be used in the future for isolation of components if possible. . . . | All concerned personnel have been cautioned and instructed not to rely on check or solonoid valves for boundary. isolations. Manual valves will be used in the future for isolation of components if possible. . . . | ||
Failure Data: | Failure Data: |
Latest revision as of 11:24, 31 January 2020
ML19340A452 | |
Person / Time | |
---|---|
Site: | Crystal River |
Issue date: | 09/15/1977 |
From: | Stewart W FLORIDA POWER CORP. |
To: | |
Shared Package | |
ML19340A448 | List: |
References | |
NUDOCS 8003260791 | |
Download: ML19340A452 (2) | |
Text
_ _ _ _ _ .- . _ _ . -- . .. . . ._. _ , - _ _ _ _ _ __ .
g . . . .
,a '*- LCENSEE
- UCENSE EVENT
- *~
NAME
- LICENSE NUMBER - TYPE TYPE '
- ] l F li, l- Q R l P l 3 l l0lul-l0l0l0l0l0l-l0l0l l 4 l 1 l1 l1 l1 l l0 l4 l 89- 14 15 , 25 26 - 30 31 32 2
"@ E74; CATECo. - T oocuT NUMsER EvENr n.TE = oRr o.TE 3 CONT l -l "l .
8 57 58 l0 l5 l0 l-l0-l3 l0 l2 l l0 l9 l0 l7 l 7l 7l 7 l 0 l 9 l1 l5 l7 l 7-59 - 60 61 68 69 74 7 E EVENT DESCRIPTON -
] l In mode 1 operation, an unplanned radioactive gas release to the Turbine Building occurred i' 'S 9
- I
~
)gandin.reportedinaccordancewithEnvironmentalTechnicalSpecification5.6.2.A. _
, 89 ' -
E-
] l Redundancy N/A. Noble gas was released to the Turbine' Building for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and 40 minutes. .
- 39 .
E
. ] ] Unplanned radioactive gas releases have been repetitive but first occurrence as a result J9 E.
~j [ of this cause.
4 '
(LER 77-107E) 39 pnug . E-system , causE coupoNENT COMPONENT 3 CODE CODE - COMPONENT COCE .SUPPUER MANUFACTURER VOLATON l j 'Pl Al y 39 10 ,
11 12 l Vl Al Ll Yl El Xl 17
@ 43 l A l 6l 1l 0l 44 47 W 48 l
CAUSE DESCRIPTON 0.-
l l l' While performing maintenance on the Eydrogen Supply System, radioactive gas from the
- - 19 -
' E .'
lf9l Makeup-Tank, leaked by valves MUV-142 and MUV--143 and to the Turbine Building via ve ;
S; l l valve HYV-25. Vent valve HY.V-25 was closed and personnel instructed not to rely on check I 9, .
,,,,,,,, ,, (SEE ADDITIONAL FACTORS 18) E; l d
STATUS - 5 POWER OTHER STATUS Dsc0VERY DescovtRY DESCAFTioN l lEl 9 10 l0l9l9l l -NA l @ l High radiation alarm on RMA-12 1 12 13 44 45 46 BC ACT COf4 TENT -
W' RELEASED AMOUNT cF ACTMTV LoCATON oF prira*F i
W 9
OF RELEASE l 185 ' curies noble gasl 10 l Release to Turbine Bldg vent to atmosphere 45 11 ,
44 BC PERSONNEL- EXPOSURES NUMtER TYPE DESCRIPTION 9
l0 l0 l0l -W 11 12 l
13 NA
. SC PERSONNEL INJURIES
- NUMC54 ' OESCRIPTON '
.l0l0l0l 9
l NA*
I 11 12 ,
6C OFFSITE - CONSEQUENCES
, l NA *
- 9 .
80 ~
f "JSS. OR DAMAGE TO FACIUTY .
TYPE DESCRIPTON .
a W 'l10 -
NA cc, l
. PUBUCITY - -
NA.
l . .
ll ADDITIONAL FACTORS l' ~ and sol'onoid valves for boundary isolation
.800326079[ wl g , .. ou
!l
-l SEE ATTACHED SUPPLEMENTARY INFORMATION *
,m -W. P'. Stewart 1) PHONE: 813/866-4159 c yy ... ......T 1
. _ , - ._ ----- __-- - - ~ ~ - - - . _ - - - - - - - , <
, , _ - . _ _ . . - _ _ . ~ -
P
. . . . 1
.~. l
. 1
. \
l SUPPLEMENTARY INFORMATION -
l Report No.: 50-302 /77-107E Facility: Crystal River Unit #3 Report Date: 15 September 1977 Occurrence Date: 7 September 1977 Identification of Occurrence: ,
. l An unplanned radioactive gas release reported in accordance with Environmental )
. Technical Specification 5.6.2. (A) .
Conditions Prior to Occurrence:
1 Mode 1 power operation in the process of performing maintenance on the Hydrogen '
Supply System. ,
Description of Occurrence: '
At 1605 the condenser vacuum pump exhaust radiation monitor RMA-12 high alarmed. An intensive investigation for a primary to secondary leak began and at 0230 on 8 September 1977 it was determined that instead of a primary to secondary leak, a radioactive gas release was being made to the Turbine Building via the Hydrogen Supply System. Further investigation revealed that maintenance was being performed on the Hydrogen Supply System. The H2 System was found isolated from the Makeup tank by closing Makeup valves MUV-142 and 143 and was vented by opening Hydrogen Valve HYV-25. Noble gas, pri:aarily Xenon 133 from the Makeup Tank was leaking by valves MUV-142 and MUV-143 and into the Turbine Bu'.lding via vent valve HYV-25. After a pe . 'od of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and 40 minutes vent valve HYV-25 wao cloud and the gas release was terminated. A total of 185 curies of noble gas was released. The instantaneous release rate was .32% of the most restrictive limit set forth in Environmental Technical Specification 2.4.2. A(1).
Designat1un of Apparent Cause:
The cause of this event has been determined to be radioactive gas from the Makeup Tank leaking by H 2 check valve MUV-142, H stop valve MUV-143 and into Turbine Building via
. 2 vent valve HYV-25.
balysis of Occurrence:
The health and saf*ety of the plant and general public were not endangered.due to the dilution factor of the Turbine Building ventilation system and the constant release rate
~
for the entire period of the release. ,
':orrective Action:
All concerned personnel have been cautioned and instructed not to rely on check or solonoid valves for boundary. isolations. Manual valves will be used in the future for isolation of components if possible. . . .
Failure Data:
Although there have been several unplanned radioactive gas releases,this is the first gas
. release caused by leaking valves.
_