ML19312E135
| ML19312E135 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 05/27/1980 |
| From: | Tollison A CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19312E136 | List: |
| References | |
| NUDOCS 8006030331 | |
| Download: ML19312E135 (30) | |
Text
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OOO Utla Carolina Power & Light Company Brunswick Steam Electric Plant P. O. Box 10429 Southport, NC 28461 May 27, 1980 FILE: B09-13516.2 SERIAL: BSEP/80-844 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Cocmission Region II, Suite 3100 101 Marietta Street N.W.
Atlanta, CA 30303 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS 1 & 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324 ADDENDUM TO NONROUTINE RADIOLOGICAL REPORT
Dear Mr. O'Reilly:
A letter addressed to you (SERIAL:
BSEP/80-691, dated April 22, 1980) discussed an unplanned release of radioactive material from the No.1 auxiliary boiler on February 22, 1980.
This letter is submitted as an addendum to the referenced report to satisfy the reporting requirements of Environmental Technical Specifications, Sec-tion 5.4.2b.
The event description, analysis, evaluation, cause of event, and corrective actions were included in the previous report.
In addition, this report includes a meteorological and off-site dose assessment of the incident using NRC approved source terms and dose conversion factors.
The results of this analysis compare closely with actual sampling of real-dose pathways.
Very truly yours, d
A. C. Tollison, Jr., General Manager Brunswick eceam Electric Plant JLK/sgb h
(\\
OO Enclosure
'7
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cc: Director - Nuclear Reactor Regulation Q*
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.,lls DOCUMENT CONTAINS POOR QUAUTY PAGES B00603033I, 3 s
AUXILIARY BOILER RELEASE : OFF-SITE DOSE Cni.CULATIONS Dose calculations were parformed for the following key off-site locations:
1.
Orton Plantation - 30 at 11,900 meters 2.
Snow's Cut
- 39 at 13,607 meters 3.
Kure Beach
- 65 at 10,824 meters The following pathways were considered (as per NRC):
1.
Inhalation (Child) i 2.
Ground plane exposure 3.
Leafy vegetable ingestion (1/6 Child annual consumption)
The following guidance and assumptions were utilized:
J 1.
Release period = 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 1
-0 2.
Cs release rate = 1.5 x 10 Ci/sec 134
-6 3.
Cs release rate = 1.23 x 10 Ci/sec 4.
Inhalation rate = 3700 n. /yr l37
-9 5.
Cs external dose factor = 4.20 x 10 g
p 6.
Cs1 ' external dose factor = 1.20 x 10-8 m 7.
Leafy vegetable ingestion rate = 26 kg/yr 2
l 8.
Vegetable productivity = 2.0 kg/m 9.
Fraction of activity retained on leafy vegetable = 0.25 10.
Inhalation dose factors (Child) l34 137 Cs Cs 2.74E-4
- (liver) 2.45E-4
- (bone) f 6.07E-5
- (whole body) 3.47E-5
- (whole body) 11.
Ingestion dose factors (Child)
Cs Cs 3.84E-4
- (liver) 3.27E-4
- (bone) 1 8.10E-5
- (whole body) 4.62E-5
- " (whole body) 1
X/Q and D/Q Values sec X/Q (W}
D/Q (m" )
Location
-6
-9 Orton Plantation 5.36 x 10 7.47 x 10
-6
-9 Snow's cut 5.66 x 10 7.86 x 10
-0 Kure Beach 3.26 x 10 4.65 x 10 '
~
DOSE
SUMMARY
1.
Inhalation Pathway l34 137 Location Ca Dose Cs Dose
-2
~
Ort.cn Plantation 9.3 x 10 mr (liver) 1.0 x 10 mr (bone)
-3
~
2.0 x 10 mr (whole body) 1.4 x 10 mr (whole body)
-3
-2 Snow's Cut 9.5 x 10 mr (liver) 1.1 x 10 mr (bone)
-3
~
2.1 x 10 mr (whole body) 1.5 x 10 mr (whole body)
-3
-3 Kure Beach 5.7 x 10 mr (liver) 6.1 x 10 mr (bone)
-3 1.2 x 10 mr (whole body) 8.5 x 10 mr (whole body) i 2.
Ground Plane Pathway
-6
~0 Orton Plantation 4.9 x 10 mr/hr 2.0 x 10 mr/hr
-6
-6 Snow's Cut 5.0 x 10 mr/hr 2.1 x 10 mr/hr
-6
-0 Kure Beach 3.0 x 10 mr/hr 1.3 x 10 mr/hr 3.
Leafy Vegetable Ingestion Pathway Orton Plantation 0.083 mr (liver) 0.086 mr (bone)
O.017 mr (whole body) 0.017 mr (whole body)
Snow's Cut 0.084 mr (liver) 0.091 mr (bone) 0.018 mr (whole body) 0.013 mr (whole body)
Kure Beach 0.051 mr (liver) 0.051 mr (bone) 0.011 mr (whole body) 0.007 mr (whole body) g n
.s.&.
......,,,v._
Carolina Power & Light Company
.m w _-- =. - = - _
Brunswick Stea= Electric Plant P. O. Box 10429 Southport, NC 28461 April 22, 1980 FILE: B09-13516.2 SERIAL: BSEP/80-691 Mr. Ja=es P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, GA 30303 BRUNS'n'ICK STEAM ELECTRIC PLANT, UNIT NOS.1 & 2 LICENSE NOS. DPR-71 AND DPR-62 DOCKET NOS. 50-325 AND 50-324 30-DAY NONROUTINE RADIOLOGICAL ENVIRONMENTAL EVENT REPORT Dea, Mr. O'Reilly:
Results of two confir:atory environmental terrestrial vegetation samples made available on March 26, 1980, indicated Csl37 concentrations of 3.66 and 2.37 pCi/gm vet weight.
- These sa=ples were obtained near Carolina Beach, North Carolina, as part of a nonroutine, follow-up environmental sa=pling program following an airborne release of radioactive material from the No.1 auxiliary boiler on February 22, 1980.
Additionally, the quarterly co=posite air sa=ple obtained from Environmental Sample Station No. 23 indicated a Csl37 concentra-tion of 2.68 x 10-2 pC1/ meter 3 The Csl37 concentrations detected in chese samples constitute a 30-day reportable event (effective March 26, 1980) in accordance with the Brunswick Plant Technical Specifications, Appendix B, Section 5.4.2b, pertinent to environmental sa=pling.
As a result of the auxiliary boiler release, calculations have revealed a maxi-mum release rate of 3.76 x 10-6 Ci/sec.
This release rate constitutes a viola-tion of the instantaneous release rate limit specified in Section;2.5.2.a(2) of the Brunswick Plant Technical Specifications, Appendix B.
Additionally, the average release rate from the site for the first quarter of 1980 of Il31 and particulates with half-lives greater than eight days exceeds the reporting level specified in Section 2.5.2.c(2) of the Brunswick Plant Technical Specifications, Appendix B.
Mr. James P. O'Reilly April 22, 1980 Corrective Actions' l.
Both auxiliary boilers were shut down and will not be returned to operation until the following items are accomplished:
a.
Inspection of boilers b.
Repair of leaks c.
Decontamination of boilers 2.
A te=porary package boiler has been installed for interim use.
3.
The auxiliary stea= and condensate pipes are being flushed and cleaned.
4.
Operating procedures have been revised to prohibit operation of the auxiliary stea= syste= with kncwn leakage of radioactivity into the syste=.
Procedures have been revised to establish a =axi=u= operating concentration of radioactivity in the auxiliary boilers.
6.
A sa=pling progra= has been established for radioactivity in the boiler and condensate on at least a daily basis.
7.
A radiation conitor will be installed in the auxiliary stea= syste= conden-sate return to the boilers.
8.
Other plant systems are being evaluated to assure there are no unkn'own potential pathways of radioactivity to the environment.
9.
The 20 GPM waste evaporator, a source of leakage to the auxiliary boilers, will not be returned to operation until its integrity is assured.
10.
An engineering investigation has been initiated to study means of reducing the potential for auxiliary stea= syste= contamination and unplanned re-leases from the syste=.
- 11. Expanded environ = ental sampling beyens Technical Specification requirements will be continued on an as-needed basis.
- 12. This incident will be reviewed by all Operations personnel and included in the operator retraining progra=.
- 13. This incident will be reviewed at the next Plant Manage =ent Meeting.
o g
Mr. James P. O'Reilly April 22,1980 A summary of total release rates for the first quarter (including those associ-ated with the auxiliary boiler spill) and environmental sample data is included in an enclosure to this report.
Off-site dose projections will be addressed in a future report.
Very truly yours s
A. C. Tollison, Jr., General Manager Brunswick Steam Electric Plant JLK/sgb Enclosures T
- e 4
4 4
4 9
1 y
--r-
SLT.ARY OF ENCLOSURES 1.
Auxiliary Boiler Spill: Chronology of Events 2.
Summary of Environmental Sample Results 3.
Estimation of Total Auxiliary Boiler Release l
4.
Summary of ist Quarter 1980 Releases 4
4 i
k l'
i l -<-
p _ -. -
_ _, - ~..
1.
Auxiliary Boiler Spill:
Chronology of Events Date Time Description 2-?l-80 All day
- 1 boiler operated without incident. Last
'2000 observation noted for 2-21; boiler operating satisfactorily.
2-22-80 0100 Auxiliary operator noted a light stea= wisp from the boiler stack. This was indicative of either a fuel-air mixture or rain in the stack (a light rain was falling at the et=e).
0300 Shift Foreman observed the boiler; confir=ed the 0100 observation.
0400 Auxiliary operator noted water dripping from beneath the #1 boiler firebox; a light wisp continued from the stack. A sa=ple of the leaking water was requested.
0600 1000 dp= of activity was detected on.the water
'eak (dip smear).
Steam was observed coming from the stack.
The Shift Operating Supervisor instructed the Shift Fore =an to shut down the boiler and bleed off pressure with the Con-tainment Atmospheric Control (CAC) vapori er to inert prior to boiler shutdown.
0630-0700 Water observed leaking from the drain nipple at the bottom of the stack.
Boiler still operating due to proble=s with the CAC vapo-
~
ri:er (valve frozen).
Steam still observed coming from the boiler stack.
Shift Operating Supervisor ordered an t= mediate boiler shut-down.
0700-071, Boiler shutdown (fire cut of f); stea= con-tinued out of the stack until %0800 when the boilers were cooled.
1900 BSEP General Manager notified NRC Region II by phone (Mr. Paul Kellogg).
2-22 2-24-80 Extensive on-site sampling program conducted for contm=inated soil and water associated with the boiler spill.
M
1 1
1 Dsta Ti==
D2ecriptien 2-22-80 Afternoon Filter pulled fro = air par:1culate sa=pler approxi=ately 1000 yds. downwind fro = the site. Analysis conducted on-site was in-conclusive; fil:er sent to the New Hill lab for analysis.
2-25-80 Afternoon Filter pulled fro = the same air sampler and sent to New Hill for analysis.
2-27-80 Afternoon Analysis of the two filters was co=pleted.
The results indicated higher than nor=al background concentrations; additional sa=ples dee=ed necessary.
2-28-80 Day Three terrestrial vegeta:1on (pine needle) sa=ples pulled a: 500 yd. intervals fro = the plant (500, 1000, and 1500 yds) in the down-wind direction.
3-4-80 Day Analysis of the vegetation sa=ples co=pleted.
Indicated levels of radionuclides (present in the auxiliary boiler spill) so=ewhat higher than nor=al. Additional sa=ples dee=ed necessary.
3-5-80 Day Six terrestrial vegetation (pine needle) sa=ples pulled.
Two of these sa=ples were repeated fro = the previous sa=pling, two were sa= pled in the 1 - 2 mile downwind distance, and two on Carolina Beach.
3-12-80 Day Analysis of the vegetation sa=ples was co=-
plated.
Indicaced essentially unchanged activities en the repeat,sa=ples and so=e activity above background on the four new samples. Additional sa=pling deemed neces-sary.
3-17-80 Day Seven terrestrial vegetation (pine needles-broad leaf) sa=ples ob:ained.
Five vere obtained on the New Hanover County peninsula between Snow's Cut (north of Carolina Beach) and Kure Beach.
Two additional sa=ples were obtained %1 =ile fro = the site in the upwind direction.
3-26-80 Day (a.=,)
Analysis of the vegetation sa=ples was com-l37 placed. Analyses indicated come Cs activity on the peninsula sa=ples (the two northern =ost sa=ples showed the highest activity; these levels are reportable by Tech.
Specs. (App. B, Section 5.4.2b).
The upwind samples showed no Csl37 levels above back-ground.
~
Date Time Description 3-26-80 Day Notifications of the event were made to the NRC Resident Inspector, NRC Region II office, and the North Carolina State Radiological Protection Branch. Additionally, the Bruns-vick and New Hanover County Civil Preparedness Directors were notified.
3-26-80 Day An extensive off-site monitoring program was initiated.
This consisted of twenty-eight terrestrial vegetation samples in all sectors around the plant (concentrating in the NE directioa), seven scil sa=ples, and all of the,
environmental ILD's.
3-31-80 Day Analysis cf the last set of samples completed.
All but four of the vegetation sa=ples were well within nor=al background levels. The TLD readings were normal.
4-3-80 Day Ten additional terrestrial vegetation sa=ples were obtained, primarily in the sectors north and west of the site.
4-11-80 Day CP&L personnel conducted an extensive land use survey on the New Hanover County peninsula to locate any potential real dose pathways and sample available vegetation.
4-14-80 Day Land use survey co=pleted.
Survey indicated several gardens in use at the ti=e of the incident, but very few people actually con-sumed frc= these gardens (determined by interview).
Dose analyses indicate exposures
<0.1 = rem for standard consu=ption rates.
S e
9 9
b
SUMMARY
OF ENVIRONMENTAL S/JfPLE RESULTS A.
AIR S M LES - 2/22/80 and 2/25/80
'Ihe weekly we'ighted gross beta cencentration (2/18-2/25) at the PMAC was.46 pC1/m3 This compares with the gross beta control station 3
concentration of.0327 pCi/m. The principal isotope detected at the PMAC was Cs137 B.
TERPISTRIAL VECETATION SAMPLES - 2/28/80 TV-1 (500 yds. downwind)
TV-3 (1500 yds. downwind) 54 54 g
- 3.69 pC1,gm (wet)
Mn
- .358 pCi/g= (wet) 60 :.907 pC1/gm (wet) 60 Co
- .357 pC1/gm (wet)
Co 11 l '.735 pCi/gm (wet) 1
- .449 pC1/gm (wet)
Ca 134 1
Cs
- 7.80 pCi/gm (wet)
Cs
- .928 pCi/gm (wer) 13 Cs
- 9.97 pCi/g= (wet)
TV-2 (1000 yds. downwind)
Mn
- .618 pCi/g= (wet) 60 :.176 pCi/gm (wet)
Co 1 ' 1.24 pCi/gm (wet)
Cs Cs
- 2.16 pCi/gm (wet)
,C.
TERPISTRIAL VEGETATION SAMPLES - 3/5/80 TV-1 (500 yds. NE)
TV-2 (1500 yds. NE) 51 5
Cr
- 2.56 pC1/gm (wet)
Mn ' :.252 pC1/gm (wet) 54 Mn
- 3.31 pCi/gm (wet) 1131 :.0978 pCi/gm (wet) 60 1
Co
- .784 pCi/gm (wet)
Cs
- .542 pC1/gm (wet) 1 ' 6.07 pC1/gm (wet) 137 Cs
- .703 pC1/gm (wet)
Cs Cs
- 8.08 pCi/gm (wet)
TV-3 (River Road alden's Creek TV-4 (River Road-Intake Canal 2.1 mi. NE) 1.6 mi. ENE) 54 1
Mn
- .439 pC1/gm (wet)
Cs
- .071 pC1/gm (wet) 1 Cs
- .693 pC1/gm (wet) j 1
Cs
- 1.23 pCi/gm (wet) 9 4
SUMMARY
OF ENVIRONMENTAL SAMPLE' RES,ULTS (CONT'D)
C.
TERRESTRIAL VEGETATION SAMPLES - 3/5/80 (Cont'd)
TV-5 (Carolina Beach 8.1 mi. NE)
TV-6 (Carolina Beach 8.1 mi. NE) 1 1
Cs
- .944 pCi/gm (wet)
Cs
- .556 pCi/gm (wet)
D.
TERRESTRIAL VEGETATION SAMPLES - 3/17/80 TV-1 (Snow's Cut 9 mi. NE)
TV-2 (Carolina Beach State Park 8.5 mi. NE) 13 :3.66,..
,m (wet)
Cs Cs137:2.37 pCi/gm (wet)
TV-3 (Carolina Beach 8 mi. NE)
TV-4 (Wilmington Beach 7.5 mi. ENE) 13 :2.33 E-1 pCi/gm (wet)
Cs13 :4.40 E-2 pCi/gm (wet)
Cs TV-5 (Kure Beach 6 mi. ENE)
TV-6 (Discharge Canal 1 mi. W) 1 7 <MDA (4.96 E-2 pCi/gs) l37:7.34 E-2 pCi/gm (wet)
Cs Cs TV-7 (Discharge Canai 1 mi. W)
Cs
- 4.99 E-2 pCi/gm (wet)
E.
ENVIRONMENTAL SAMPLING - 3/26/80 3.891034E-1 pg)/gm 1.
US 421 5 NC 132
- Cs (possible trace of Co (14.5 mi NNE) 1.64 + 0.23E-1 pCi/ m 2.
Myrtle Grove
- Cs 7.37i3.33E-2pCifgm 60 (14.5 mi. NNE)
Co 3.
NC 1100 at Snow's Cut
- Cs 8.66 1 0.35E-1 pCi/gm (9 mi. NE) 4.
NC 1100 (3 mi. north of Snow's Cut)
- Cs 3.49 + 3.02E-2 pCi/gm (10.5 mi. NNE)
(trace of Ci60) 5.
US 421 & NC 1492
- Cs 1.82 + 0.31E-1 pCi/gm 60 (11.3 mi, NE)
Co 1.24 1 0.25E-1 pC1/gm 6.
Wrightaville Beach Road 37 near CP&L Garage
- CS 2.70 + 0.32E-1 pCi/gm (Wilmington %20 mi. NNE)
(trace of Cg60) t
-~
SDetARY OF ENVIRONMENTAL FAMPLE RESULTS (CONT'D)
E.
ENVIRONMENTAL SAMPLING - 3/26/80 (Cont'd) 7.
NC 133 at Town Creek
- <MDA (12.5 mi. N) 8.
Env. Station #7 (Olde 1
Brunswick Towne)
- Cs 3.39 1 0.24E-1 pCi/gm (7.2 mi. NNE) 9.
Env. Station #16 (River Road At Construction
- Cs 2.67 + 0.19E-1 pCi/gm 60 Entrance) (1.1 =1 SE)
Co 5.11 - 1.49E-2 pCi/gm 137 10.
Emerg. Env. Station #20
- Cs 5.27 + 0.30E-1 pCi/p 60 5.05 1 2.75E-2 pCi/gm (1.2 ni. WNW)
Co 60 11.
NC 1100 at Mott Creek
- Co 5.96 + 1.54E-2 pCi/gm
~
(13 mi. NNE)
Csl37 3.99 1 0.24E-1 pCi/gm 60 12.
NC 1573 at Kure Beach
- Co 5.92 + 2.35E-2 pC1/gm Cs 37 3.35 _+ 0.25E-1 pCi/gm l
(6. 3 mi. ENE) 13.
Hugh McRae Park 137 1.23 + 0.26E-1 pC1/gm (Wilmington)
- Cs 60 7.37 1 3.38E-2 pC1/gm (N20 mi. NNE)
Co 14.
NC 1573 at Wilnington
- Co60 7.02 1 2.80E-2 pCi/gm Beach (7.3 mi. ENE)
Csl37 5.12 1 0.29E-1 pCi/gm 60 15.
Federal Point (4.5 =1. E) : Cc 1.07 + 0.24E-1 pCi/gm l37
~
Cs 3.77 + 0.31E-1 pC1/gm 60 8.98 + 2.58E-2 pC1/gm
- 16. Pretty Pond (8.8 =1.
N)
- Co Csl37 1.44 1 0.05E+0 pCi/gm
- 17. Emerg. Env. Station #24
- Co60 7.38 + 2.47E-2 pCi/gm (1.4 mi. NNE)
Csl37 8.02 - 3.02E-2 pCi/gm 18.
Emerg. Env. Station #22
- Cs137 1,92 1 0.18 pC1/gm (1.2 =1.
NNW) i 19.
Emerg. Env. Station #40
- Co 2.04 1 0.17E-1 pCi/gm (2.5 mi. N)
Cs 1.04 + 0.04E+O pC1/gm 20.
Emerg. Env. Station #39
- Co60 1.01 + 0.20E-1 pCi/gm 137 1.27 - 0.16E-1 pCi/gm (3.5 mi. NNW)
Cs 60
- 21. Env. Station #14
- Co 8.75 + 2.68E-2 pCi/gm 137
~
(River Road) (1.3 mi. ESE) Cs 3.16 0.27E-1 pC1/gm
=
e e, e
4
SUMMARY
OF ENVIRON'4 ENTAL SAMPLE RESULTS (cont'd)
E.
ENVIRONMENTAL SAMPLING - 3/26/80 (cont'd) 22.
Env. Station #11 (E. end of Bethel Church Road)
- Co 5.68 : 3.37E-2 pC1/gm I37 (1.6 mi. NNE)
Cs 2.24 : 0.31E-1 pCi/p 23.
NC 1573 & Carolina Beach
- Co 1.04 2 0.22E-1 pCL/gm (8 mi. NE)
Cs 1.48 2 0.04E+0 pCi/gm 24.
Jabbertown Road
- Cs 1.04 1 0.23E-1 pCi/gm 6
(1.3 mi. SSW)
Co 7.23 2 2.04E-2 pC1/gm 25.
River Road & Intake Canal : Cs 1.19 0.28E-1 pCi/gm 0
(1.6 mi. ENE)
Co 4.27 2 1.96E-2 pCi/gm 26.
Emerg. Env. Station #41
- Cs 1.28 2 0.21E-1 pCi/gm (2.4 mi. NNE)
Co60 1.25 : 0.19E-1 pCi/gm 37 27.
Emerg. Env. Station #42
- Cs 9.39 1 2.03E-2 pC1/gm 6
(2.5 mi. NE)
Co 0 8.47 : 2.00E-2 pCi/gm 137 28.
Emerg. Env. Station #43
- Cs 2.60 :
.30E-1 pCi/gm (2.7 mi ENE)
Csl34 8.66 2 3.19E-2 pCi/gm 54 Mn 5.78 1 1.78E-2 pCi/gm 60 Co 4.44 1 3.51E-2 pCi/gm SOIL SAMFLES (pCi/gm dry) 1.
Pretty Pond
- Cs 1.80E-1 pCi/gm 2.
Env. Mon. Station #7
- Cs 1.53E-1 pC1/gm 3.
Env. Mon. Station #11
- Cs 7.77E-2 pCi/gm 4., Federal Point
- Cs 6.23E-2 pCi/gm 5.
River Road at Discharge
- <MDg37:
(Cs 2.80E-2 pCi/gm MDA)
Canal 13 6.
SR 1100 at Snow's Cut
- Cs 4.43E-1 pCi/gm 7.
Emerg. Env. Station #20
- Cs 1.94E-1 pCi/gm
~
l l
~
~
~
SUMMARY
OF ENVIRONMENTAL SAMPi.E RESULTS (CONT'D)
F.
TERRESTRIAL VEGETATION SAMPLES - 4/1/80-4/4/80 1.
Camp Pretty Pond
- Csl37 2.44E-1 pCi/g*2 (wet) l37 2.76E-2 pC1/gm (wet) 2.
US 17 and NC 87
- Cs (Bell Swamp) 60 3.
US 17 at Lanvale Rd.
- Co 7.85E-2 pCi/gm (wet) l37 Cs 8.16E-2 pCi/gm (wet) 4.
NC 133 NE of Boiling
- Cs137 5.04E-1 pC1/gm (wet)
Spring Lakes 5.
NC 87 at E=er. Station #61: Co60 4.40E-2 pCi/gm (vet)
Csl37 5.41E-2 pCi/gm (wet) l 6.
NC 1500 at Emergency
- Cs137 6.61E-1 pC1/gm (wet)
Station #62 7.
NC 211 and NC 1112 at
- Csl37 5.98E-2 pCi/gm (wet)
Emergency Station #63 8.
Sunset Harbor near
- Co60 6.49E-2 pC1/gm (wet)
Emergency Station #50 Csl37 2.32E-1 pCi/gm (wet) 9.
Long Beach nr._r Emergency : Csl37 2.31E-1 pCi/gm (vet)
Station.#52 10.
Ward's Corner on US 421
- All nuclides <MDA G.
TERRESTRIAL VEGETATION - FOOD CROP SAMPLES - 4/11/80 1.
500 Yds. NE from Plant (Terrestrial Vegetation) 51 Cr 1.41 x 100 pCi/gm (wet) 54 0
Mn 3.63 x 10 pC1/gm (wet)
S8 Co 1.59 x 10-1 pCi/gm (wet) 60 Co 1.26 x 100 pCi/gm (wet) 134 Cs 4,47 x ggo pCi/gm (wet) 1 Cs 6.33 x 100 pCi/gm (wet) 2.
Mustard Greens at Zure Beach - All radionuclides <MDA M
w
SUMMARY
OF ENVIRONMENTAL SAMPLE RE5Uf.TS (CONT'D)
G.
TERRESTRIAL VECETATION - FOOD CROP SAMPLES - 4/11/80 3.
Collard Greens at Kure Beach Cs 3.26 x 10-2 pCi/gm (washed)
I 4.
Carolina Beach (Terrestrial Vegetation) 1 Cs 7.14 x 10-1 pCi/gm (wet) 5.
Carolina Beach (Soil)
Cs 2.37 x 10-1 pCi/gm (dry) 6.
Snow's Cut (Terrestrial Vegetation) 13 Cs 7.50 x 10-2 pC1/gm (wet) 7.
Snow's Cut (Soil)
Cs 2.88 x 10-2 pCi/gm (dry)
Cs 2.15 x 10-1 pci/gm (dry)
~
8.
Emergency Station #40 (Terrestrial Vegetatien) 1 0
Cs 2.19 x 10 pCi/gm (wet) 9.
Emergency Station #42 (Terrestrial Vegetation) 137 <.y Cs 10.
Jones's Farm (Fodder) 1 Cs 2.90 x 10-2 pCi/gm (wet) 11.
Jones's Farm (Soil)
Cs 3.54 x 10-1 pCi/gm (wet) 12.
Freeman's Market - Carolina Beach Road (Collard Greens) 137 Cs 3.22 x 10-2 pCi/g= (washed) 13.
Carolina Beach (Collard Greens)
All radionuclides <MDA o
e e
ESTIMATION OF AUXILIARY BOILER RELEASE (2/22/80)
I.
ACTIVITY BASIS - No. 1 MUD Drum Analyais of 1/24/80 51 Cr
- 1.83E'-3 pC1/ml 54 Mn
- 2.52E-4 pCi/ml S8 Co
- 2.58E-5 pCi/ml 60 Co
- 3.08E-4 pCi/ml 11 1
- 1.17E-3 pC1/ml 1'
Cs
- 4.22E-3 uCi/ml 13 Cs
- 5.14E-3 pCi/ml II.
LEAK TIME ESTIMATE The last " normal" observed auxiliary boiler operation was %2000 hours on 2/21/80.
The boiler was shut down and stea=ing ceased by 0800 hours0.00926 days <br />0.222 hours <br />0.00132 weeks <br />3.044e-4 months <br /> on 2/22/80. Conservatively assuming the leak began at 2000 on 2/21/80, a total leak time of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is esti=ated.
III. LEAK RATE ESTIMATE Following the incident, inspection of the No. 1 boiler uncovered a pin-hole tube leak of approximately 1/8" diameter.
By exa=ining the shape and " texture" of the leak site, it appears that the inner tube wall was gradually eroded away by steam until an actual perforation of the tube occurred (see attached drawings). The smoothness around the leak site indicates the steam gradually caused the pinhole to enlarge and " smooth-out" to its final site and shape.
To best model this phenomenon, it is conservatively assumed that at 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> on 2/21/80, the outer tube wall was penetrated by the steam.
The leak continued to enlarge until boiler shutdown (N0800 hours on 2/22/80), when the leak reached its final size.
For the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> period, it is postulated that the leak rate increased linearly. By engineering calculation (for the operating conditions of the boiler), the maximum leak rate for an 1/8" diameter hole is 4.6 gpm.
The following table shows the predicted leak rate as a function of ti=e.
Time (hours)
Leak Rate (gpm) 0 (start of leak) 0
'1 0.38 2
0.77 3
- 1. 15 4
1.53 5
1.92 6
2.3 7
2.68 8
3.07 9
3.45 10 3.83 11 4.21 12 (end of leak) 4.60 0
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SUMMARY
OF ISOTOPIC RELEASE RATES AS A FUNCTION OF TIME 0
1 2
3 4
5 6
7 8
9 10 11 12
{
Isotopes Release Rates (pC1/Sec) 51 Cr 0
4.43E-2 8.86E-2 1.33E-1 1.77E-1 2.22E-1 2.66E-1 3.10E-1 3.55E-1 3.99E-1 4.43E-1 4.88E-1 5.32E-1 Hn 0
6.11E-3
- 1. 22 E-2 1.83E-2 2.44E-2 3.05E-2 3.67E-2 4.28E-2 4.89E-2 5.50E-2 6.11E-2 6.72E-2 7.33E-2 S8 Co 0
6.25E-4 1.25E-3 1.88E-3 2.50E-3 3.13E-3 3.75E-3 4.38E-3 5.00E-3 5.63E-3 6.25E-3 6.88E-3 7.50E-3 60 Co 0
7.47E-3
- 1. 4 9 E-2 2.24E-2 2.99E-2 3.73E-2 4.48E-2 5.23E-2 5.97E-2 6.72E-2 7.47E-2 8.21E-2 8.96E-2 I
2.83E-2 5.67E-2 8.50E-2 1.13E-1 1.42E-1 1.70E-1 1.98E-1 2.27E-1 2.55E-1 2.83E-1 3.12E-1 3.40E-1 Cs 0
1.03E-1 2.05E-1 3.08E-1 4.10E-1 5.13E-1 6.15E-1 7.18E-1 8.20E-1 9.23E-1 1.03E+0 1.13E10
- 1. 23 E40 I3 Cs 0
1.24E-1 2.48E-1 3.73E-1 4.97E-1 6.21E-1 7.45E-1 8.69E-1 9.93E-1 1.12E10 1.24E40 1.37EIO 1.49 E40 TOTAL 0
3.13E-1 6.27E-1 9.40E-1
).25E+0 1.57E+0 1.88E10 2.19E40 2.51E10 2.82E10 3.13E10 3.45E60
- 3. 76 E10 I
s.
ESTIMATION OF AUXILIARY BOILER RELEASE (2/22/80) (CONT'D) i IV.
TOTAL ACTIVITY LEAL 2D Average release rate
- 1.88 pCi/sec (Based on 12 hr. linear average)
(1.88 uCi/sec) (
) (12 hr) (yg3*fg)=81.2 mci hr On an isotpoic basis:
Cr
- 11.5 mci Hn
- 1.58 mci S8 Co
- 0.16 mci Co
- 1.94 mci l1 I
- 7.34 mci Cs
- 26.6 mci Cs
- 32.2 mci
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RELEASE RATE OF 1 FIRST QUARTER 1980 WEEKLY % CONCENTRATIONS STACK (C1 ALL VENTS (Ci see see TO QUARTERLY LIMIT WEEK 1/1-1/7 6.65E-8 3.83E-8 12.69 1/7-1/14 3.56E-8 2.98E-8 9.47 1/14-1/21 1.75E-3 5.51E-9 2.02 1/21-1/28 1.04E-8 6.71E-9 2.19 1/28-2/4 9.08E-9 5.85E-9 1.91 2/4-2/11 4.90E-8 1.27E-8 4.88 2/11-2/18 2.03E-7 5.11E-8 19.79 2/18-2/25 3.20E-8 1.47E-7 43.09*
2/25-3/3 1.42E-8 7.02E-9 2.38 3/3-3/10 6.44E-9 3.15 E-9 1.07 3/10-3/17 2.25E-9 4.09E-9 1.23 3/17-3/24 1.59E-9 4.90E-9 1.45 3/24-3/31 1.12E-9 4.52E-9 1.33 AVERAGE 3.45E-8 2.47E-8 103.5%
- Approximately 92% of this amount was a result of the No.1 Auxiliary Boiler leak of 2/22/80.
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